Adhering wood panel to fiberglass? - Fiberglass RV


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Old 03-15-2016, 08:56 AM   #1
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Talking Adhering wood panel to fiberglass?

I am rebuilding a casita from an empty shell.

the bottom fiberglass isn’t completely flat so I want to attach wood panels to it to straighten and strengthen. (it also ‘sags’ over the side of the frame.)

What is the suggested way of bonding the wood to the fiberglass floor?

My idea is either epoxy resin or fiberglass resin. (whats the difference?)

I don’t really like the idea of screws or bolts.

I have to cover the entire floor area, so cost is some consideration too.

My initial idea is to lay a coat of something on the fiberglass, put down the wood layer, then another heaver coat of something on top of the wood.

(By the way, I will have the shell off of the frame on concrete garage floor)
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Old 03-15-2016, 09:45 AM   #2
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Use PL Premium (Polyurethane Construction Adhesive)? It is easy and simple to work with, seems bond well.
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Old 03-15-2016, 09:52 AM   #3
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Fiberglass resin would probably be less expensive an easier to work with. I have done both, PC11 2 part epoxy is great stuff to but not cheap as it come in small containers and doesn't go far. Bondo resin is under $40/gallon depending on where you get, one or two should be enough...

What you could do is cut the floor pieces to fit then put them in place and fiberglass them to the outer wall of the trailer all the way around, then secure the floor to the frame drilling through the fiberglass and wood and putting lag bolts through the frame and both layers...did it to my Boler and it is solid...
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Old 03-15-2016, 10:08 AM   #4
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Applying wood to fiberglass? Nothing any better than 5200.
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Old 03-15-2016, 11:01 AM   #5
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Fiberglass resin

Here's another vote for fiberglass resin. It will also soak into the plywood making it water proof, which is important for the floor. They put it all over the bottom of the Scamp when they are built.
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Old 03-15-2016, 11:18 AM   #6
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Originally Posted by KevinScamps View Post
Here's another vote for fiberglass resin. It will also soak into the plywood making it water proof, which is important for the floor. They put it all over the bottom of the Scamp when they are built.
I agree with Kevin, I used the spray on plastic in a can for the underside of my floors but if I had it to do over again I would apply a coat of fiberglass resin on the underside before putting the wood in place just for the purpose of waterproofing and preserving the wood. No need to used the fiberglass mat or cloth for that, only where it bonds to the body would I use the mat.
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Old 03-15-2016, 11:37 AM   #7
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Fiberglass resin and screw the wood down to the bottom layer. Once cured, remove the screws.
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Old 03-15-2016, 11:58 AM   #8
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Danny, the empty shell WILL cause the sag along the bottom and sides as the shell starts to take the shape of a bubble. The closet, seats, cupboards, etc. all contribute to the stability and shape of the shell. If you plan to have any of these items, I would start by replacing them and only then put the wood in as you have described.
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Old 03-15-2016, 04:59 PM   #9
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I guess I don't understand what you people are talking about when you say fiberglass resin. Never heard of it. Epoxy , polyester, vinyl -ester yes but not fiberglass resin. Please enlighten me.
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Old 03-16-2016, 12:39 PM   #10
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What you said are all fiberglass resins.
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Old 03-16-2016, 12:54 PM   #11
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fiberglass resin = polyester resin

epoxy can be used for fiberglass, but is different. Epoxy is more expensive, but adheres much better, however stuff like gel coat will not adhere well to it without some effort. The scamp was made with polyester resin.
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Old 03-16-2016, 03:38 PM   #12
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What you said are all fiberglass resins.
That's my point, calling it Fiberglass resin is meaningless.
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