Fiberglass Resin Recommendations? - Page 4 - Fiberglass RV

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Old 01-26-2015, 07:49 AM   #43
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Name: Jim
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Please play nice, folks. Everyone has the right to an opinion. Please state your opinion, and move on, allowing the OP to make their own decision. Well mannered discussion is fine.

I have not done hordes of fiberglass resin work, but I have built a wood strip canoe using epoxy resin and fiberglass cloth. It turned out great.

I am also in the midst of repairing four 2 1/2" holes in the Trillium I am working on, where the various service hatches were (city water, gravity water fill, 120V cable, grey water outlet). I followed techniques often used in repairing boats, where I tapered the fiberglass from near 0" at the hole, out about 1 1/2" to flush. After sanding and cleaning around the inside of the hole, I then used polyester resin, and laid a layer of glass cloth on the inside, which provided a backer for a full repair from the outside. I then cut out four pieces of fiberglass mat (not cloth) of varying sizes, each saturated with polyester resin, to fill the hole in the shell.

This last part was done yesterday, and so is where I am at now. Today I will sand the patch flush to the shell. I will then prime the area, and use an epoxy filler to level the patches, and then fair the hull. After this, I will prime again before paint.

I am also using the epoxy filler to fill hundreds of old screw holes, as it provides good strength as well as good adhesion.

I will be posting photos on the rebuild thread once I get it done. Pretty darn confident it will all work out great.

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Old 01-26-2015, 09:06 AM   #44
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One thing we use in the rc hobby is micro balloons which are used as a filler in epoxy to thicken and lighten the resin. It should be good for filling the small holes and I have even used it to seal a crack in the Casita shower pan. I have used it to fill cracks in planes with superglue , just fill the space with the micro balloons and wick in thin superglue(it is hard to sand with the super glue)Fiberglass Supply- Fillers and Modifiers

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Old 01-26-2015, 11:01 AM   #45
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Name: Walter
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British Columbia
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I don't recommend that average DIYer use micro balloons, this material is an extremely fine granule almost like corn starch. It's actually glass spheres, and just like with starch, it's extremely prone to becoming airborne when agitated. Unlike starch, micro balloons are extremely hazardous to your health. If you inhale the dust, it coats your lungs, and doesn't dissolve. And those cheep throw away dust mask won't protect you. You need a special cartridge that's listed on the MSDS sheet. The average garage is not the place to open a container of micro balloons.

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Old 01-26-2015, 11:17 AM   #46
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Name: kevin
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Micro Balloons

I just use regular kitchen flour instead of anything fancy to thicken epoxy. It works great. You can buy fiberglass fibers which would be stronger, but not worth the effort if you ask me. The micro balloons are going to be lighter, but who cares about saving a few ounces on a thousand pound trailer. Save the money and your health and use flour.

I didn't read the whole thread, but I would stick to whatever system the PO used. If they used polyester resin continue with that, if they used epoxy than continue with epoxy. Epoxy over polyester is fine since epoxy will stick to anything. Polyester over epoxy not so good since it will NOT stick as well. That being said I have good experience with polyster over epoxy once I removed the amine blush (I was working in a cold garage).
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Old 01-26-2015, 07:01 PM   #47
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Name: Darwin
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It was pointed out that I clouded the issue by posting a site to look at that delt with Gel Coat. The site also delt with resins however you would have to search within that site for it.

Here is a site that deals with patching and the various types of structure product to use and identify. It has a wealth of information about fiberglassing and how to do it.

Fiberglass and Composite Repair | Fibre Glast

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