Name this compound! - Fiberglass RV


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Old 12-18-2016, 07:11 PM   #1
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Name: Eric
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Name this compound!

I am installing the front dinette into a 2014 Trillium shell. All other internal structural fiberglass pieces (galley, closet, etc.) were previously installed by Trillium USA. The seams of those pieces were sealed by a thick compound I am not familiar with but I'm guessing it is some type of resin and hardener. This stuff was also used to build up areas behind the plywood window frames where the wood did not meet with fiberglass because of the curvature of the trailer shell. I would like to use the same stuff because it is extremely tough and does the job well. I would appreciate if anyone can identify from the attached photos and let me know.

Eric
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Old 12-18-2016, 07:27 PM   #2
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Looks like plastic filler. One of the many variations of Bondo.
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Old 12-18-2016, 08:18 PM   #3
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Thanks Steve. Bondo was my first thought too but I took a hammer to some really thick spots (approx 3/4") and that stuff didn't crack or chip off. I even tried to remove a spot with a chisel but the only thing that worked was grinding it down. I thought maybe it was some other compound specific to fiberglass I was unaware of. Guess I should have stuck with my first guess!
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Old 12-18-2016, 08:56 PM   #4
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It might be wood flour, Wood ground to the consistency of flour then mixed with epoxy. That's what holds our plywood kayaks together.
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Old 12-18-2016, 10:21 PM   #5
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guesses, Pollyester resin, JB Weld,
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Old 12-18-2016, 10:26 PM   #6
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Ah, that is an excellent guess. Thanks, I'll have to look into it.
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Old 12-18-2016, 10:39 PM   #7
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I would check it a automotive paint and body shop supply store. There are numerous types of fillers available. If you want to stay with a product that is readily available at retail stores, Marine Tex is a product that is stronger than Bondo or JB Weld.
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Old 12-19-2016, 02:27 AM   #8
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I'm kind of surprised that none of our Trill experts haven't answered yet. Sounds like it's a pretty tough material.
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Old 12-19-2016, 10:30 AM   #9
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Looks like fiberglass & resin without the gel coat doesn't it. They have a lot of that around while making the FGRV.

Sent from my SM-N900T using Fiberglass RV mobile app
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Old 12-19-2016, 12:01 PM   #10
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Autobody filler and fiberglass preparations are similar products. They use a polystyrene base which is catalyzed to a solid by a hardener. When sanded they produce a fine dust with a distinctive hydrocarbon odor. Don't breathe this dust. It is very toxic. These products are comparable as they use the same base. Filler is easier to shape, fiberglass is stronger due to the glass fibers. Adhesion is the main concern. Surfaces must be free of grease, oil, corrosion etc. Roughing them up with sandpaper, grinder etc. improves adhesion.
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Old 12-19-2016, 12:20 PM   #11
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I've got a 2010. Same stuff. I agree, bondo. When I had a leaking belly band they sent me some.
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Old 12-19-2016, 12:26 PM   #12
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I used a product while building canoes from the West Systems called Fillet.
I belive it was just ground fiberglass like a powder and when mixed with the epoxy it could be used a filler or as a glue.
STRONG STUFF but I thing too expensive for any large project.
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Old 12-19-2016, 02:42 PM   #13
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With polyester resin you can use almost anything with it, medical Gauze, Screen wire, Sawdust, Fiberglass and fiberglass powder, Micro bubbles, Cloth.
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Old 12-19-2016, 06:21 PM   #14
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To beef up the fiberglass around the windows when replacing the frames on our '76 Trillium, I used polyester resin and the finest door screen I could find. Then a very thin layer of body-filler to smooth out the work. I don't like using fiberglass cloth as it makes me itch like crazy. Next time I'm going to try using polyester cloth. And yes, as someone suggested, be careful! Invest in an appropriate chemical mask when working with any two part compound and a good particulate mask for sanding. Don't leave things like cushions in the trailer when you are working and be fussy about cleanup. I wasn't always so careful, but as the saying goes, if I'd known I'd live this long, I'd have taken better care of myself!
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