Easily sanded when cured using a fairing … To ensure good adhesion with highly thickened mixtures, apply a thin coat of unthickened epoxy to the surface before troweling on the fairing compound. Here is the first of 2 video’s where I look to see if there’s any truth to the belief that polyester based materials (such as gelcoat) won’t bond to epoxy. Doing so will result in the gelcoat failing to cure properly. I will be using epoxy resin for layup. You want to make sure that all of the hardener is incorporated into the resin. I am building a 16′ stitch and glue power boat designed by Bowdidge Marine Designs in Australia. Its aways best to apply glass onto glass (when possible). The white resin and gray hardener are mixed 1:1 by volume, not weight, until streaks are not visible. Luckily none of this has broken through the gel however I am going to have quite a lot of fairing and filling this winter. Will you be finishing with primer, barrier coat, topcoat, or gelcoat? It claims it kills the blush. Getting your boat ready for Fall? EZ-Fair Epoxy Fairing Compound 7050 is a lightweight, two-part epoxy putty designed for filling and smoothing surface imperfections above and below the waterline. * Lastly, the bonding surface needs to be well scuffed with sandpaper to ensure a good mechanical bond. When all the fairing is completed the surface often consists of a combination of fiberglass laminate, fairing compound and old paint or gelcoat. 9. fairing compound over gelcoat ? To Repair a laminate polyester of my boat which resin you advice? Simple.. Over the years I’ve “broken the rules” on occasion and to date have not had any issues using gelcoat as my topcoat over epoxy. Check out his web site for all the details. I have heard the epoxy used is critical. * Cure time and temp. A wipe-down with acetone and / or a wax remover both before AND after sanding will remove surface contaminates. If the gelcoat has been damaged to the point where you can see the cloth pattern underneath or it has become delaminated, it will need to be repaired prior to application of primer. The crack is below the waterline. There’s alternating patches of fairing compound, epoxy primer and even gelcoat! I was wondering what you thought. When considering this idea, there are a few things to keep in mind (and these are VERY important)! Something that I want to emphasize is that the above steps are not only geared to epoxy. I will typically stir for a minimum of 1 – 2 minutes. I can’t speak from experience. Knife or squeegee the compound into the blister cavities until they are flush with the surface and allow to cure hard. EXP System 2 part Epoxy Intermediate Hardener (5:1) $ 15.25 – $ 175.70. Because Boatworks Today, its owners or partners cannot control how the information provided through these videos is applied, we will not be held liable for any damages; incidental or consequential. Im a novice at this stuff but am a pretty handy guy, your videos have helped tramendously. Apply until the mixture is slightly raised above the hull surface. The template can be used to form guides to assist in the application of fairing compound on the rest of the foilâs surface. If you really want to cover your bases, transfer the mixed epoxy to a clean cup and stir a bit more. Or do you have a different recommendation? Warm water and a scotch-bright pad Amine is water soluble and is easily removed. They claim that you can use it as a tie Coat. This will ensure that all the hardener is well incorporated. Also, please remember that there are extended ad-free versions of these video’s available for Patreon supporters! Can I coat the EZ-Fair with 105 Epoxy Resin let it set then finish off with Gel-Coat? I have a few areas where the barrier coat and gelcoat has been totally removed. Add to Wishlist + Quick View. Those of us using epoxy never put gel coat directly on top the epoxy. I am thinking about sanding down stress cracks on a Laser hull and then laying in fiberglass cloth using the 206 epoxy based on your test followed by bottom paint. Just wondering why you did not test the high build???? As with any gelcoat job, the surface must be perfectly faired with auto body and/or lacquer putty, or fairing compound before spraying. VEFAIR will adhere to a wide variety of materials such as wood, plywood, brick, masonry and fibreglass. This example shows a tool that flexes only in one direction and could be usedÂ on the chine of a round bilge hull. Use the epox to repair a polyester laminate is correct? They can be purchased, or made from hacksaw blades. Epoxy fairing compound is suited for above-the-waterline and below-the-waterline applications. After sanding the 2nd application of thickened epoxy, there will be some minor gaps and imperfections. After these strips cure, fairing compound can be applied between them to fair in the entire surface. Finishing the Gelcoat Repair with Fairing Compound. These are good general rules when working with composites; either polyester or epoxy. High humidity resistance and very good flexibility. They call it flow coat and add styrene to slow the cure rate. The size of affected parts ranges from 6" to 18" so I am looking for a good epoxy fairing compound that will work well in the cold shed. Templates are very useful when fairing foils and can be created from a drawing or a surface. How about jelcoat in a femaile mold, prep as in the video, then make a Kevlar/epoxy boat? Also, is an epoxy primer over the awlfair required or can I just top off with numerous coats of the Interlux Epoxy based Interprotect 2000? It is advised that you allow your epoxy to cure for at least 3-4 days before moving forward. Second issue. Sounds like the process you outlined is prep for painting? Mas Fairing Compound is a 50-50 mix of yellow and blue pastes (part A and B) that yields a consistent, green hue when mixed properly. Fairing & Filling Compounds These filling and fairing compounds are perfect for structural and cosmetic fiberglass repairs. Once the shape is right, then a coat or two of bottom paint Hope this helps! Fairing compound is typically not particularly strong. Hi Andy Fairing Compound should be of a consistency that can be troweled onto a surface without sagging. biaxial glass over meranti marine plywood. Or is there another product you can suggest? It is designed to be easily sanded. Additional Application Notes A fairing compound contains resin—either epoxy, polyester, or vinyl ester, and each resin is designed for different purposes. Thank you!! Before deciding on a fairing compound, think about whether the faired area is above or below the waterline, and how you plan to finish the faired surface. If it’s not fully cured you’re going to run into problems. Regardless of the resin you decide to use, if the mating surfaces are not fully cured and clean it may come back to haunt you! You’re safe to use poly above or below the waterline. Please click below to find out more. How do you take care of this? Dont listen to the critics about your videos, the education of these products are money saved in my pocket. Make sure the compound extends beyond the repair area. But he found it necessary to remove ALL the original gelcoat from the Gougeon-produced, West-System boat. Vinylester Fairing Compound (VEFAIR) is a high build material, ideal for use in the marine and pool industry as a filler. Highly thickened fairing compound mixtures will have very little epoxy available to wet the surface of the hull and may be an issue on porous surfaces such as wood. Tracing the shape onto a board gives you a rough shape and then a batten can be used to make it a fair curve. 4118 Marine Epoxy Fairing Compound. A second application will fill in the valleys. Can micro balloons (insert other sandable filler) be used in the gelcoat as a fairing compound? Sandwich foam between heavy-duty cloth-backed vinyl. Logically the test results should be independent of whether epoxy is applied to gel coat or gel coat is applied to epoxy. Discussion in 'Fiberglass and Composite Boat Building' started by newo eloc, Jul 7, 2005. The marine epoxy fairing compound is for fairing surface imperfections or corners on a variety of surfaces with excellent weather resistance, for … How about same prep, epoxy over gelcoat? That’s pretty much the exact steps I take when spraying Awlgrip I put this demo together for folks who are looking to use epoxy for their repairs but still finish off with gelcoat to blend their work. Wipe off excess fairing compound before it hardens to avoid unnecessary sanding. I keep hearing that a product call System Three SB-112 is an epoxy that is 100% with Polyester. Can you apply gelcoat over the fairing compound? Saw cut through bottom vinyl and foam core only. Very good filling properties. When all the fairing is completed the surface often consists of a combination of fiberglass laminate, fairing compound and old paint or gelcoat. Usually I would shoot gelcoat over the mold prior to layup when using polyester resin. A coat of thickened epoxy creates a uniform and stable surface ahead of final finish. Can TotalFair be applied over epoxy resin? The boat is epoxy and 12 oz. Instead, apply TotalBoat 2-Part Epoxy Primer or TotalBoat TotalProtect Epoxy Barrier Coat Primer over TotalFair, before applying Gelcoat. Epoxy has a lot of appeal for repair work (extended work times, stronger mechanical bonding, better moisture protection, etc). After marking the low spots, use a spreader with a notch to create a âguide.âÂ After a strip of fairing compound is applied, the batten can be wrapped in release fabric and placed into the fairing compound. Since these three modes of failure occurred under similar loads, it indicates that the strength of the bond is close to the cohesive strength of both the gelcoat and the fairing compound. There are specific materials intended for this purpose. Matrix gelcoats are sold per kg. I get so frustrated at gel coat that wont set up. Now I have a doubt. The nine-week exposure may not simulate what could happen after many years, but it does indicate that the gelcoat bond to epoxy laminates is a good bond and should perform well. Before applying gelcoat, you must overcoat TotalFair with an epoxy barrier coat or epoxy surfacing primers, such as TotalBoat TotalProtect or TotalBoat 2-Part Epoxy Primer. The goal of fairing is to create aÂ surface without bumps or hollows. Fast-curing formula is great for filling, fairing, shaping, and repair applications on properly prepared fiberglass, wood, aluminum, steel & existing 2-component paints and primers in … Or do I need to coat with Petitt protect. Consider ambient temperature when selecting hardener. I’m not saying that it’s common practice, but in certain circumstances it’s something that I have done successfully. We generally use a high build epoxy primer, and then a finish primer and then a 2 part polyurethane. The final finish to this gelcoat repair is going to be fairing compound. I'm seeking advice for the 'right' fairing compound to basically fair my entire hull (below waterline). Scrape the sides of the mix cup, scrape the bottom; repeat, repeat, repeat!. But that’s ok, the next two coats of epoxy primer will cover that and prep it for the two part polyurethane paint! I was reading online about the renovation of a Gougeon G-32 Catamaran. I am guessing, if I use gelcoat I would need to let the gelcoat fully cure, washing away blush, prior to epoxy layup? Use long strokes to spread out filler compound over the damaged hull. Reduce sanding by applying the first layer of fairing compound with a notched trowel. The only alternative is to use TotalBoat Polyester Fairing Compound instead of TotalFair. Since these three modes of failure occurred under similar loads, it indicates that the strength of the bond is close to the cohesive strength of both the gelcoat and the fairing compound. Hi Pat! Joined: Jul 2005 Posts: 16 ... Epoxy fairing over foam sandwich cores. Use a chalk and a batten (a long, flat, strip of metal, plastic or knot-free wood) to find the low and high spots on the surface, then decide whether to proceed by filling in low spots or removing high spots. This is a sort-of obscure question be relevant. The fairing compound will fill in low spots. * Clean, Clean, Clean Make sure that the surface you’re bonding to is very clean. Provides, when used in combination with DP3350 Fairing Lite, a complete filling and fairing solution for turning rough surfaces into perfectly smooth areas. A bond is only as good as the surface that you’re bonding to. Though gelcoat is NOT a paint, it's important to note that before applying gelcoat over cured TotalFair, the surface must be primed with an epoxy barrier coat (such as TotalBoat TotalProtect), or an epoxy surfacing primer (such as TotalBoat 2-Part Epoxy Primer). If the voids you are filling are over ½” deep, apply the epoxy mixture in several applications or use 206 Slow Hardener or 209 Extra Slow Hardener, depending on the ambient temperature. biaxial glass over meranti marine plywood. * Proper ratio’s of resin to hardener are VIP. Let cure 6 hours. Compare to 3M Marine Premium Filler, FGCI Gelcoat Putty, and Evercoat Polyester Glazing Putty. Only the top of the ridges formed by the trowel will be cut by the sand paper. Depending on the temps you’re working in, epoxy can take a few days to fully cure. Add skim coat of F5 Filler / Epoxy compound to achieve a … By applying a coat of thickened epoxy to the entire surface, a more uniform and stable surface will be created ensuring an excellent surface for the final finish. The fairing compound can be applied right after you apply the unthickened coat, but you may want to wait until the unthickened coat becomes tacky so a thick application of fairing compound does not slide on the surface. Scrub the surface with clean water, wipe the surface dry with a clean papertowel and this detail is taken care of. Can I still use gelcoat or should I paint instead, after popping the bimini from mold? Shop Our Amazon Store For Fiberglass Materials And Supplies! This compound has a potlife of 85 to 95 minutes, and will cure to be slightly flexible which will help to resist cracking. If this is the case, in these areas start with a 100 percent solids epoxy such as WEST System Epoxy. fallguy, Apr 28, 2019, in forum: Fiberglass and Composite Boat Building. Can gelcoat be applied over cured TotalBoat TotalFair epoxy fairing compound, or do I need to prime first? Please ‘Like’ or ‘Share’ above and join the discussion below in our comments section!! You may be able to see in the picture what I am talking about. When removing material it is very important to use a âlong boardâ which you may have to make yourself. Poly-Fair F26 fairing compound is used primarily in the boat building and fiberglass fabrication industries for fairing and sanding plugs, molds, one-off custom boats, fairing of lead keels (not if coated with epoxy), fairing of keel to hull joints, repair of damaged fiberglass parts, and mold rework/modification. I have done it with epoxy and it worked fine but it was hard to sand. I have found if you grind down the surface of the west sytem after cure well below gel coat with a dremel grinding bit and then use 3m above and below filler to act as a bonding agent between the new gel coat and epoxy resin, the gel coat seems to set up just fine. Yes. The gelcoat must be thinned slightly with reducer to spray evenly (although acetone is often recommended from thinning, it will cause the finish to more quickly lose its brightness, color, and gloss). I really enjoy your site and the You-tube video you provide. We dont want to have to sand the epoxy but generally would prefer to sand the high build as its a lot easier. […] is the first of a two-part video series clearly demonstrating the techniques Andy used for his challenge, following up with the results as […]. I would like to use the Petitt EZ-Fair over the fiberglass repair. I will generally use 60 or 80 grit paper and sand the surface until it is uniformly dull in appearance. EXP System 2 part Epoxy Epoxy Resin $ 16.25 – $ 365.60. Do I need to coat the EZ-Fair with anything to give it a good bond to the Gel-Coat? Custom sanding tools may be required for gunwales, toe rails and style lines. Cutaway: Hacksaw blade glued in place with G/5 Adhesiive. Most DIY owners are typically working on boats that have a gelcoat exterior, which is what the focus of this experiment was geared towards. Colour Paste Colour Paste – 225 mL(8 oz) $ 27.75 – $ 42.50. Suitable for use over rough substrates. Next video will show the results of the tests! Thickness may very to adjust flexibility. | Developed by Fortiris Group LLC. Vary teeth-per-inch of hacksaw blade for more or less abrasion. Gelcoat should not be applied directly over TotalFair or the gelcoat will not cure properly. If you’re looking to prevent stress cracks from coming back, I’d sand the surface down to bare glass, then apply the new material followed by bottom paint. Will the gelcoat/ filler have enough bond to get me a good smooth surface over the roving? If below the waterline I’ll typically do any fairing with thickened epoxy as it provides a better moisture barrier. When selecting your hardener, consider the required working time, the ambient temperature, amount of epoxy that will be mixed, and desired cure speed. It’s been long believed that if you were using epoxy for your fiberglass repairs, you were more or less limited to having to use paint as your topcoat. Get a 5% discount on Totalboat products. Note: On vertical and overhead surfaces, allow the wet-out epoxy coat to gel before applying the epoxy fairing compound. Hope this helps! The boat is epoxy and 12 oz. Recommended as spray fairing for all Imron® Marine systems; Substrates Polyester or epoxy? Mix Pettit 7050 EZ‐Fair Epoxy Fairing Compound according to the label instructions. Scrapers are a great tool for removing drips, runs and ridges because they will cut away only the protruding surface defect. I am currently restoring 2 GRP yachts which have some bad scuffing in the gelcoat. I am building a 16′ stitch and glue power boat designed by Bowdidge Marine Designs in Australia. It is brushed on and then flecked with a spray gun. I am preparing to build a trimaran using a similar technique but his renovation has given me pause. They call it flow coat and add styrene to slow the cure rate. The special resins used in EZ-Fair impart a high degree of water and chemical resistance to the product, making it an integral part of the Pettit Gelcoat Blister Repair System. Once the EZ-fair is properly shaped I would like to finish off with Gel-Coat. No. http://gougeon32.blogspot.com/search?updated-max=2016-02-16T07:51:00-08:00&max-results=10&start=6&by-date=false Could that work. The special resins used in EZ-Fair impart a high degree of water and chemical resistance to the product, making it an integral part of the Pettit Gelcoat Blister Repair System. © 2020 Boatworks Today. Gelcoat should not be applied directly over epoxy fairing compounds like TotalFair. Grinding the West System to below the gel coat seems like it will cause leaks in the future. Can I apply Marine-Tex Gluvit to a wet surface? I’d like to spray jelcoat in my female mold, cure 3 days, remove amine, scuff well, then build epoxy and Kevlar boat as usual. Maybe not in a year or two but water instrusion kills boats. In many cases automotive type body work tools will be too short and dual action rotary sanders should be used only for creating a profile on the surface. If used below the waterline, Polyester Fairing Compound must be overcoated with TotalBoat TotalProtect Epoxy Barrier Coat Primer. After filling and fairing, apply a high build primer. Hi Andy. You can make a fairing compound by adding a filler material to resin. I would be more interested to see a test of gelcoat over unknown epoxy and left in the weather for a few months. Share this post. What can I use to make emergency hull repairs below the waterline? Primers are sold separately. It does not add any structural integrity to the hull. This is a film that forms on the top layer of epoxy that will inhibit the cure of polyester material as well as create bonding issues. Also what about Pettit’s Tie Coat Primer? Can Interlux Watertite Epoxy Filler be sanded and painted? Gelcoat will not cure properly if applied directly to cured TotalFair. Thank you again for your wonderful videos. Can fairing compound be used below the waterline? Become A Monthly Supporter Of Boatworks Today Through Patreon! The Matrix range of gelcoats provide solvent free, high build, epoxy gelcoat or coating systems with exceptionally high chemical resistance and low vapour transmission properties. At least there were for this repair. When the studs were pulled, the failures occurred in the fairing compound, cohesive failure of the gelcoat, or in the bond between the gelcoat and laminate. Also I have heard West system, the one used in the video, is one epoxy that can be used under gel coat. http://gougeon32.blogspot.com/search?updated-max=2016-02-16T07:51:00-08:00&max-results=10&start=6&by-date=false. By applying a coat of thickened epoxy to the entire surface, a more uniform and stable surface will be created ensuring an excellent surface for the final finish. There are boat builders using epoxy layup over gelcoat in the mold and that works but repairing them is another matter. Here’s the link: The repair is safe? Fairing compound (epoxy/407 or 410 mixture) sags and is difficult to sand Thick fairing compound (epoxy/407 or 410 mixture) sags Paint, varnish or gelcoat will not set up over epoxy Add to Wishlist + Quick View. Mark Bowdidge has been using Gelcoat over the epoxy on his boats for years but only on the inside of the boat. Danny in Baltimore. I have just completed a repair using the west system. EZ-Fair 7050 Epoxy Fairing Compound is a lightweight, two-part epoxy putty designed for filling and smoothing surface imperfections above and below the waterline. The 4118 Marine Epoxy Fairing Compound is a UV-stable paste with very little shrinkage for applications above and below the waterline.. Ok gelcoat over epoxy. Right: 1/4″ wood strips. The person doing it is a professional boatbuilder and was working closely with West Systems people in consultation. * Presuming the mix ratio’s are correct, having everything properly mixed is another important step. Add 407 Low Density or 410 Microlight filler to mixed epoxy, checking the consistency as you stir in the filler to determine if the mixture has the correct viscosity for your application. Now, the renovator is a self-admitting obsessive. How to successfully apply a gelcoat finish over WEST SYSTEM Epoxy. Your videos are strike such a perfect tone; you really have a sense of your audience! It was epoxy laminate into polyester gelcoat with some kind of ‘tiecoat’ included in the layup schedule vacuum pressed into the female mold. I have been using west system to plug holes left in my transom from previous owners accessories. TotalBoat TotalFair marine epoxy fairing compound is easy to mix, easy to spread, and easy to sand to a super-smooth finish. Mark Bowdidge has been using Gelcoat over the epoxy on his boats for years but only on the inside of the boat. TotalBoat Polyester Fairing Compound drags smoothly, sets up fast, and sands like a dream. Too much or too little can result un-uncured epoxy. The sanding board must be flexible enough to bend, but stiff enough that it will maintain a fair curved when it does flex. * A natural by-product of epoxies curing process is something called amine (or amine blush). I am using a male mold to build a bimini covering for my center cockpit sailboat.