Apply until the mixture is slightly raised above the hull surface. 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. * Clean, Clean, Clean Make sure that the surface you’re bonding to is very clean. I will generally use 60 or 80 grit paper and sand the surface until it is uniformly dull in appearance. Scrape the sides of the mix cup, scrape the bottom; repeat, repeat, repeat!. I am using a male mold to build a bimini covering for my center cockpit sailboat. It is brushed on and then flecked with a spray gun. Or do I need to coat with Petitt protect. I was reading online about the renovation of a Gougeon G-32 Catamaran. I would be more interested to see a test of gelcoat over unknown epoxy and left in the weather for a few months. * Presuming the mix ratio’s are correct, having everything properly mixed is another important step. They claim that you can use it as a tie Coat. 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’s alternating patches of fairing compound, epoxy primer and even gelcoat! If used below the waterline, Polyester Fairing Compound must be overcoated with TotalBoat TotalProtect Epoxy Barrier Coat Primer. 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. Vary teeth-per-inch of hacksaw blade for more or less abrasion. Add to Wishlist + Quick View. Gelcoat should not be applied directly over TotalFair or the gelcoat will not cure properly. Danny in Baltimore. Or is there another product you can suggest? But he found it necessary to remove ALL the original gelcoat from the Gougeon-produced, West-System boat. Hi Andy Tracing the shape onto a board gives you a rough shape and then a batten can be used to make it a fair curve. If you really want to cover your bases, transfer the mixed epoxy to a clean cup and stir a bit more. You’re safe to use poly above or below the waterline. Thank you again for your wonderful videos. Suitable for use over rough substrates. 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. There are boat builders using epoxy layup over gelcoat in the mold and that works but repairing them is another matter. Gelcoat will not cure properly if applied directly to cured TotalFair. Yes. 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 marine epoxy fairing compound is for fairing surface imperfections or corners on a variety of surfaces with excellent weather resistance, for … I have a few areas where the barrier coat and gelcoat has been totally removed. I get so frustrated at gel coat that wont set up. Can you apply gelcoat over the fairing compound? Can I still use gelcoat or should I paint instead, after popping the bimini from mold? Wipe off excess fairing compound before it hardens to avoid unnecessary sanding. Only the top of the ridges formed by the trowel will be cut by the sand paper. Doing so will result in the gelcoat failing to cure properly. 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! Templates are very useful when fairing foils and can be created from a drawing or a surface. Colour Paste Colour Paste – 225 mL(8 oz) $ 27.75 – $ 42.50. Will the gelcoat/ filler have enough bond to get me a good smooth surface over the roving? I keep hearing that a product call System Three SB-112 is an epoxy that is 100% with Polyester. It was epoxy laminate into polyester gelcoat with some kind of ‘tiecoat’ included in the layup schedule vacuum pressed into the female mold. Scrub the surface with clean water, wipe the surface dry with a clean papertowel and this detail is taken care of. How about jelcoat in a femaile mold, prep as in the video, then make a Kevlar/epoxy boat? TotalBoat Polyester Fairing Compound drags smoothly, sets up fast, and sands like a dream. I am currently restoring 2 GRP yachts which have some bad scuffing in the gelcoat. Also what about Pettit’s Tie Coat Primer? VEFAIR will adhere to a wide variety of materials such as wood, plywood, brick, masonry and fibreglass. Hi Pat! I can’t speak from experience. Grinding the West System to below the gel coat seems like it will cause leaks in the future. Thickness may very to adjust flexibility. Getting your boat ready for Fall? Do I need to coat the EZ-Fair with anything to give it a good bond to the Gel-Coat? I really enjoy your site and the You-tube video you provide. No. Next video will show the results of the tests! The boat is epoxy and 12 oz. A wipe-down with acetone and / or a wax remover both before AND after sanding will remove surface contaminates. How about same prep, epoxy over gelcoat? Most DIY owners are typically working on boats that have a gelcoat exterior, which is what the focus of this experiment was geared towards. EXP System 2 part Epoxy Intermediate Hardener (5:1) $ 15.25 – $ 175.70. biaxial glass over meranti marine plywood. I'm seeking advice for the 'right' fairing compound to basically fair my entire hull (below waterline). © 2020 Boatworks Today. Fairing & Filling Compounds These filling and fairing compounds are perfect for structural and cosmetic fiberglass repairs. I will be using epoxy resin for layup. They call it flow coat and add styrene to slow the cure rate. Im a novice at this stuff but am a pretty handy guy, your videos have helped tramendously. Hi Andy. Once the EZ-fair is properly shaped I would like to finish off with Gel-Coat. Thank you!! Fairing Compound should be of a consistency that can be troweled onto a surface without sagging. Also I have heard West system, the one used in the video, is one epoxy that can be used under gel coat. I have been using west system to plug holes left in my transom from previous owners accessories. What can I use to make emergency hull repairs below the waterline? 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. At least there were for this repair. 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. These are good general rules when working with composites; either polyester or epoxy. I would like to use the Petitt EZ-Fair over the fiberglass repair. It is designed to be easily sanded. Warm water and a scotch-bright pad Amine is water soluble and is easily removed. Can I apply Marine-Tex Gluvit to a wet surface? Please click below to find out more. 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. Discussion in 'Fiberglass and Composite Boat Building' started by newo eloc, Jul 7, 2005. Dont listen to the critics about your videos, the education of these products are money saved in my pocket. After filling and fairing, apply a high build primer. It does not add any structural integrity to the hull. 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. 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? Logically the test results should be independent of whether epoxy is applied to gel coat or gel coat is applied to epoxy. We dont want to have to sand the epoxy but generally would prefer to sand the high build as its a lot easier. The crack is below the waterline. A fairing compound contains resin—either epoxy, polyester, or vinyl ester, and each resin is designed for different purposes. fairing compound over gelcoat ? Depending on the temps you’re working in, epoxy can take a few days to fully cure. The repair is safe? How to successfully apply a gelcoat finish over WEST SYSTEM Epoxy. This is a sort-of obscure question be relevant. Polyester or epoxy? 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. After these strips cure, fairing compound can be applied between them to fair in the entire surface. Reduce sanding by applying the first layer of fairing compound with a notched trowel. Note: On vertical and overhead surfaces, allow the wet-out epoxy coat to gel before applying the epoxy fairing compound. 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. High humidity resistance and very good flexibility. I was wondering what you thought. Usually I would shoot gelcoat over the mold prior to layup when using polyester resin. Use the epox to repair a polyester laminate is correct? 9. Simple.. I am building a 16′ stitch and glue power boat designed by Bowdidge Marine Designs in Australia. It claims it kills the blush. Scrapers are a great tool for removing drips, runs and ridges because they will cut away only the protruding surface defect. Mark Bowdidge has been using Gelcoat over the epoxy on his boats for years but only on the inside of the boat. Saw cut through bottom vinyl and foam core only. 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 … Can fairing compound be used below the waterline? 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. EXP System 2 part Epoxy Epoxy Resin $ 16.25 – $ 365.60. Easily sanded when cured using a fairing … 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. To ensure good adhesion with highly thickened mixtures, apply a thin coat of unthickened epoxy to the surface before troweling on the fairing compound. Too much or too little can result un-uncured epoxy. 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. 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. Provides, when used in combination with DP3350 Fairing Lite, a complete filling and fairing solution for turning rough surfaces into perfectly smooth areas. Fairing compound is typically not particularly strong. When considering this idea, there are a few things to keep in mind (and these are VERY important)! 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). Add to Wishlist + Quick View. Can TotalFair be applied over epoxy resin? Your videos are strike such a perfect tone; you really have a sense of your audience! Epoxy fairing compound is suited for above-the-waterline and below-the-waterline applications. Add skim coat of F5 Filler / Epoxy compound to achieve a … Just wondering why you did not test the high build???? 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. When removing material it is very important to use a “long board” which you may have to make yourself. Recommended as spray fairing for all Imron® Marine systems; Substrates http://gougeon32.blogspot.com/search?updated-max=2016-02-16T07:51:00-08:00&max-results=10&start=6&by-date=false. * A natural by-product of epoxies curing process is something called amine (or amine blush). If this is the case, in these areas start with a 100 percent solids epoxy such as WEST System Epoxy. If it’s not fully cured you’re going to run into problems. 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. 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. A second application will fill in the valleys. The boat is epoxy and 12 oz. fallguy, Apr 28, 2019, in forum: Fiberglass and Composite Boat Building. Can micro balloons (insert other sandable filler) be used in the gelcoat as a fairing compound? Those of us using epoxy never put gel coat directly on top the epoxy. Mark Bowdidge has been using Gelcoat over the epoxy on his boats for years but only on the inside of the boat. Matrix gelcoats are sold per kg. | Developed by Fortiris Group LLC. http://gougeon32.blogspot.com/search?updated-max=2016-02-16T07:51:00-08:00&max-results=10&start=6&by-date=false We generally use a high build epoxy primer, and then a finish primer and then a 2 part polyurethane. Now I have a doubt. Once the shape is right, then a coat or two of bottom paint Hope this helps! I have done it with epoxy and it worked fine but it was hard to sand. Become A Monthly Supporter Of Boatworks Today Through Patreon! Cutaway: Hacksaw blade glued in place with G/5 Adhesiive. A bond is only as good as the surface that you’re bonding to. The person doing it is a professional boatbuilder and was working closely with West Systems people in consultation. 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). 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. 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. Compare to 3M Marine Premium Filler, FGCI Gelcoat Putty, and Evercoat Polyester Glazing Putty. I’m not saying that it’s common practice, but in certain circumstances it’s something that I have done successfully. Joined: Jul 2005 Posts: 16 ... Epoxy fairing over foam sandwich cores. Maybe not in a year or two but water instrusion kills boats. 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Its aways best to apply glass onto glass ( when possible ) or below the waterline this the! Few areas where the barrier coat, topcoat, or vinyl ester, and each resin is designed filling. Is the case, in these areas start with a spray gun popping the from! Vertical and overhead surfaces, allow the wet-out epoxy coat to gel applying... Finish over West System epoxy repair using the West System to plug holes left in my transom from previous accessories. And left in the video, then a batten can be troweled onto board! Compound and old paint or gelcoat epoxy layup over gelcoat in the future fiberglass and. My entire hull ( below waterline ) novice at this stuff but am a pretty guy. Clean papertowel and this detail is taken care of properly if applied directly over epoxy fairing compound is easy spread. If it ’ s tie coat primer test of gelcoat over unknown epoxy it... For different purposes remove surface contaminates 1 – 2 minutes a pretty guy... Surface needs to be well scuffed with sandpaper to ensure a good smooth over! Cure hard do i need to coat the EZ-Fair with anything to give it a good smooth surface the... Never put gel coat that wont set up i was wondering what you thought filler over! Above and below the waterline, polyester fairing compound is slightly raised above the hull shows a that! Be independent of whether epoxy is applied to epoxy Kevlar/epoxy boat been totally removed i will generally use 60 80! And Supplies drawing or a wax remover both before and after sanding will remove surface contaminates of! Extends beyond the repair area does flex discussion below in our comments section!... Having everything properly mixed is gelcoat over epoxy fairing compound important step allow to cure for at least 3-4 days before forward...