Category: Gelcoat over fiberglass repair

Gelcoat over fiberglass repair

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Gel Coat vs Epoxy Resin

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gelcoat over fiberglass repair

For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter floppybear Start date Jun 18, Joined Oct 30, Messages I have a couple of scrapes and scuffs I need to repair before getting out on the water I have no idea what it would cost to repair these, and I thought about doing it myself but I have no experience and it might be better left to a pro to repair.

So, what is a ballpark for how much these might cost to repair? I ordered some marine tex and thought about fixing the long scratch on the bottom of the hull myself, but I'm not sure it's the right material, and the subsurface started to crack a bit when I lightly sanded it to prepare the surface. For now, I'm leaving it as is until I can try to get a few quotes for the repair and some additional advice.

Joined Dec 28, Messages 24, Can you get at this from the inside? Scott Danforth Grumpy old guy who plays with boats.

Joined Jul 23, Messages 34, I cannot get to that from the inside without significant destruction of the boat's interior. The white scratch is on the bottom of the hull.

It is below the waterline and I definitely agree it needs to be repaired.

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The boat isn't going back in the water until it's all repaired. I found a shop that's a little bit further out in the country but has a really great reputation for charging low prices and doing great quality work.Gel coat is the most common surface coating used in the fabrication and repair of fiberglass reinforced products. Gel Coat is a specially formulated two-part polyester resin that is designed to be the first layer of resin applied in a mold when making a polyester or vinyl ester composite part.

It is intended to create an opaque surface which will completely block glass pattern show-through. Polyester resins in general, and specifically gel coats, are naturally UV resistant, and properly cured parts can be submerged in water. Most boats are made using gel coat with polyester resin and fiberglass.

Composite parts are generally made in a female mold. The gel coat would be applied to a prepared mold surface and then backed with layers of reinforcement usually fiberglass and additional resin. When the part is removed from the mold, this gel coat surface would be the exterior surface of the part. A red boat is usually red because the fabricator used red gel coat. While gel coat can be applied by brush or roller, we strongly recommend the use of spray equipment. Fibre Glast offers spray guns specifically for gel coat.

Fiberglass & Gelcoat Repair

It features a 3. There are a variety of nozzle sizes available for different materials, but the primary use of this gun is to quickly apply gel coat to large areas. It is most frequently used for new part and mold construction rather than repairs. Coverage will vary depending on application techniques and desired thickness. Typically, however, one gallon of gel coat will cover between square feet at mils.

Since gel coat was designed for in-mold applications, the process is straightforward and relatively simple. Gel coat is usually sprayed into the mold in several thin passes. After the MEKP hardener is added, there is generally about 20 minutes of working time before the gel coat will begin to harden. Some fabricators like to thin the gel coat before spraying and will add pure liquid styrene also referred to as Styrene Thinner or Monomer to the gel coat.

Gel coat should not be thinned with a solvent such as Acetone because the solvent will break down the molecular chains that the resin is made of and interfere with the properties of the cured gel coat.

When a fabricator releases his part from the mold and sees a perfect, glossy gel coat surface, it is a very satisfying moment. Since the gel coat has been backed by subsequent reinforcement and resin, it can't be seen until it is out of the mold. Gel coat is now part of the final composite.

Fiberglass/Gel Coat repair cost?

It is not a "coating. In a properly fabricated and cured part, the gel coat should not delaminate nor should the gel coat "chip" off from the surface because it is not a surface coating. If you are making a polyester or vinyl ester part in a mold, using gel coat is highly recommended as the proper material for the exterior surface.

Fibre Glast offers over colors of gel coat for your composite parts. Applying gel coat as a secondary operation as a coating requires some additional considerations. Since gel coat is polyester resin based and was designed for in-mold use, it will require an air inhibitor in order to properly cure.Forums New posts Search forums. What's new New posts New media New resources Latest activity. Media New media New comments Search media. Resources Latest reviews Search resources. Members Current visitors.

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Can fiberglass be safely laminated to gel coat? Thread starter Darren Nemeth Start date Sep 29, Darren Nemeth Chief Petty Officer.

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Joined Dec 25, Messages For my Batboat overhaul I need to replace the air scoops, those things that look like "eyes" on the bow. Will I be able to securely bond these new forms using poly resin and wood flower mixture directly to the gel coat or will I have to grind the areas down to the fiberglass?? Thank you in advance.Your browser's Javascript functionality is turned off.

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gelcoat over fiberglass repair

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Men's Clothing.Last Updated: August 5, References. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. There are 11 references cited in this article, which can be found at the bottom of the page. This article has been viewed 3, times.

gelcoat over fiberglass repair

Learn more Gelcoat is the protective coating that covers the fiberglass of boats and other watercraft. When you get a gouge or a scratch in the gelcoat of your fiberglass, you will have to clean it up by grinding or sanding before you can repair it.

To finish the job off, sand it again until it is completely smooth, then buff and wax it to get it looking like new. Warning : Make sure you mix enough of the gelcoat to repair the entire damaged area at once. If not, it may not all cure at the same rate. We've been helping billions of people around the world continue to learn, adapt, grow, and thrive for over a decade. Every dollar contributed enables us to keep providing high-quality how-to help to people like you.

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This image may not be used by other entities without the express written consent of wikiHow, Inc. Use a rotary tool with a burr bit to taper the edges of gouges.

Attach a V-shaped burr bit to a rotary tool such as a Dremel tool. Turn it on and hold the tip against one side of the gouge at a degree angle. Move it back and forth along the sharp edge of the gouge, applying light pressure, to smooth it out. Repeat this for the other side to create a U-shaped groove. A burr bit is a type of bit that comes in various cone shapes and can be used for sanding and grinding.

You can get both things at a home improvement store or order them online. Use this method for deep gouges or chips that have sharp edges.Log in or Sign up. Boat Design Net.

Not wanting to learn too many new skills at once read "Old Guy" I need to make some relatively small repairs on much large parts and would like to use gel coat as a finish only experience is with awlgrip. One of the repairs is to a hinged flange on a engine compartment hatch, and would like to use epoxy resin to repair the area due to its superior strenght and ability to bond to poly resin as well as other materials.

Is there any way to finish an epoxy repair with gel coat.

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Thank You. If the area isn't highly stressed, you can use gel coat over epoxy. One note is to use a slow epoxy cover coat, as the last step, before "toothing" for the polyester gel coat.

It'll stick and better than you think, again so long as it's not highly loaded. If it is highly loaded like a slammed hatch lid might bebulk up the area with fabric and epoxy, so it's overly stiff and stable, to lower stresses and gel coat as you like.

Now, some out there are bunching up their panties, because I've suggested polyester gel coat over epoxy doesn't bond well. This is true on flexible surfaces, like the flanks of a hull shell or the bottom of a powerboat, but in localized areas, where you can control flex, you'll be fine. In other words, don't make a 40 MPH powerboat from epoxy, then cover it with gel coat, as it'll bust up and crack fairly quick, but if if the engine cover needs a repair, go for it, after beefing up the area.

PARJun 4, Thanks Par, I figured you'd be the first to chime in. That great news by the way. Duratec makes a vinylester surfacing product for doing just this. I had good luck with it. I haven't tried it edit- for this! It is very reactive. It gels in the bottle in sunlight! Not instantly, but you have to keep it in your basement. It might work for that applicationtoo.

I haven't tried it for just that yet. Last edited: Jun 4, Log in or Sign up. Boat Design Net. Good afternoon. I've spent hours reading threads but I would still like some advice on the ways to go about this. She's an MGC 27 sailing built So really its a two prong question, I need advice with the non-skid areas and for the gloss coaming areas etc.

I've attached some photos This has held up reasonably well, although its getting thin in places and I'm seeing some slight bleed through of the original colour, especially when the deck is wet.

However I've removed some old deck hardware, filled some holes etc, so really to do the job properly I'd rather renew the lot. I can match the non skid pattern by taking a mould off the existing non-skid and using thickened gelcoat, which I'm happy with, but regarding covering the rest of the non skid, what's the best method? As its going over the top of the old pattern does it need thickening? Plus the old gelcoat is so gone it simply won't buff back anymore.

There seem to be all sorts of methods I'm reading about out there, but my tenative plan is to: - Sand with 80 grit. I'm not adverse to spraying, but I would have to go and buy the equipment for it.

Any advice on how to go about this much appreciated. And please if your advice is to paint it, I realise that paint would probably be easier, and I've done it on previous boats. But this time around I want to avoid that and keep it gelcoat. I'm prepared to put in the extra work. Current gelcoat condition in cockpit. Prior to reglassing holes Current Non-Skid Photos:. Last edited: Mar 21, Midday GunMar 21, Welcome to the forum.

Lots of non-skid techniques. Some easily done others not so. I have rolled many hundreds of gallons of gelcoat. My local air quality control board forbids spraying it. Rolling adds considerably more time and effort to the wet sanding and polishing phases.

You won't sufficiently develop the tipping off skill in this project. I strongly suggest rolling three coats of gelcoat onto a full 4x8 sheet of plywood, sanding it smooth and polishing it before starting on your boat.

gelcoat over fiberglass repair

Then decide if investing in spray equipment is warranted. If you do decide to spray, please use your 4x8 test panel. This panel is also useful to test non-skid techniques.

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