body attachment - Page 2 - Fiberglass RV

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Old 06-21-2016, 10:43 AM   #15
Senior Member
Name: K C
Trailer: 1980 18' Sunrader Motorhome and 1971 Trails West CampMite Campster
Posts: 774
Originally Posted by Lionel View Post
Thanks for the info.
I have looked for the bolts and have not found them.
I will put bolts through the floor and frame flange.
I will work on the self drilling screws. There are more heads in the compartment than screws coming out the bottom. I will work on each one from inside the trailer and make sure I have enough that seem to be working to hold the floor to the frame and take out the rest. I will plug the holes with body putty.

I have spoken to a person who worked with fiberglass who said that folding the fiberglass over the plywood 2 inches made a very secure bond.

Thanks again for the input.
The automotive industry "Bondo" types of fillers are not a structural adhesive filler. That is why I suggest epoxy putty, it is a structural adhesive filler. It is much less likely to loose its grip on the interior edges of holes in metal, wood, fiberglass, etc. and it can rebuild strength to layers of plywood versus Bondo filler that can't do that. Also the auto industry fillers are hygrosopic meaning they will absorb moisture after curing. Epoxy fillers do not absorb moisture.

Rule is do the job right the first time or you will be doing it again. Most people don't realize that Bondo has its weaknesses, I certainly did not before I started living among professionals in the marine industry. They straightened me out on what to do for repairs versus the common knowledge that gets applied to patching up cars on the cheap.

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Old 06-21-2016, 03:09 PM   #16
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Name: Garry
Trailer: 13 ft Boler
Posts: 26
Well, I got mine figured out.
I went under the trailer and seen how the frame was set up. Mine has a rectangular frame with a flange welded to it (I think that is the best way to describe it). I drilled a pilot hole with a small bit through the flange and it came up just inside the front seat compartment. You can see the flange in the top picture. The screws are sticking down.
I then made the whole with a 1/4 inch bit and used a 1/4 inch bolt with large fender washers and tightened it down.
I will work on the rear set up tomorrow.

The advise I get on this forum is great. It has helped a lot.
I feel better now understanding how the floor is attached and that I have done a bit to secure it as I travel along the road.
Good luck all.

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Old 06-21-2016, 03:43 PM   #17
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Name: Garry
Trailer: 13 ft Boler
Posts: 26
Got it - epoxy putty it is.

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