Walmart Epoxy? - Fiberglass RV


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Old 04-12-2016, 05:53 PM   #1
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Walmart Epoxy?

Sorry if this is a dumb question but I've never done fiberglass work before. I'm patching some small holes as well as the exhaust vent where the furnace was and I was wondering if any fiberglass Epoxy would work? I'm going to Walmart so I was hoping to just get some there. Thank you.
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Old 04-13-2016, 07:55 AM   #2
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You might want to go to your local Ace Hardware Store and buy Marine-Tex. It is a two part epoxy putty that is white, waterproof, and won't soak up water. It is very easy to use. If they don't have it in stock, they can order it. It is mostly used on boats, and is a known quality product. Wal-Mart doesn't make any fillers, they just sell them.
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Old 04-13-2016, 08:51 AM   #3
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Yes it will work.

But are you intending on painting it after your finished?

The reason I ask is some are darker and are not clear.
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Old 04-13-2016, 08:53 AM   #4
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Are you looking for putty to fill small holes or are you looking for resin and fiberglass matting to cover a large area ?
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Old 04-13-2016, 10:15 AM   #5
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I did my restoration of a '71 Boler with Bondo Resin and Hardner bought from Walmart, did tons of fiberglass work with it. They also sell the matte cloth and have best prices on both. Check out fiberglass dave's trread here on fiberglass repair, some very good info there.
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Old 04-13-2016, 10:45 AM   #6
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I think I would use Marine Tex. It's a 2 part putty made for fiberglass boats.
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Old 04-13-2016, 11:47 AM   #7
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the exhaust vent is a large opening, I would use Fiberglass resin and matte cloth for a good strong patch, rivets holes, etc could be easily done with the Marine Tex but if you were going to use that on the vent hole I would still use some type of fiberglass matte, cloth or tape with it.
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Old 04-13-2016, 12:03 PM   #8
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I will be covering some little holes as well as the large furnace vent hole. I did order pc-11 Epoxy putty, is Marine Tex better and should I buy that instead? I just read that pc-11 is easy to use a syringe with to inject it into the holes which is why I went with that.

Also, yes I will be painting the entire camper in a few days. Does this change anything that I should be using to patch holes with?
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Old 04-13-2016, 12:13 PM   #9
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PC-11 is an excellent and extremely strong and water proof epoxy and is more readily available than Marine Tex in some areas, found at most hardware stores. I used the PC-11 to bond some things on my Boler where fiberglass would not work well.
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Old 04-13-2016, 12:18 PM   #10
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Quote:
Originally Posted by Johnny M View Post
PC-11 is an excellent and extremely strong and water proof epoxy and is more readily available than Marine Tex in some areas, found at most hardware stores. I used the PC-11 to bond some things on my Boler where fiberglass would not work well.
The route I was going to take was to patch the back of the accessible holes with a small piece of fiberglass mat and Walmarts 3m resin then take a countersink to clean up the exterior hole and fill with the pc-11. Does this sound about right?
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Old 04-13-2016, 01:54 PM   #11
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Yes that should work fine. On the larger vent you should make 3 pieces of matte, one the size of the hole one a little large than the first and the 3rd even larger. Wet out the area and using a temporary support covering the hole. place the same size patch in the hole, wet out then apply the larger, wet out and repeat again. I repeated the process on the opposite side of the shell to make a stronger patch for the larger holes
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Old 04-13-2016, 01:55 PM   #12
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Make sure you throughly clean the area first and roughing it up helps but is not required. A dirty or oily surface could result in delamination of the patch.
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Old 04-13-2016, 04:38 PM   #13
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Thanks Johnny, that is very good and clear to understand advice. I will clean up the area with acetone and rough it up before I apply the mat. As for the temporary support, would cardboard with wax paper work fine taped from the exterior?

Should I do anything from the exterior of the large vent hole such as removing some gel coat from the perimeter of the hole and bevelling the edges? Or is that not necessary when applying the bondo/marine Tex?
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Old 04-13-2016, 05:02 PM   #14
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I've used PC 11 for small holes, 1/4" or smaller with good results. It's sticky, unlike a putty. I would not use PC 11 for a large hole. Bondo is one solution. A trip to a boat place like West Marine might bring better ideas. When I needed to fiberglass a leaking belly band, I got good advice there. Raz
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