Attaching plywood to the fibreglass floor - Fiberglass RV


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Old 06-01-2020, 11:14 PM   #1
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Name: Sonny
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Attaching plywood to the fibreglass floor

Hi everybody, The original cabinet which housed the sink/stovetop/fridge was removed by a previous owner. The spot where it used to sit has no plywood on the floor. Its just the exposed fibreglass. I want to re-build a cabinet in that same spot. Should I use adhesive to attach plywood to the floor before i start construction? Any tips? Thank you, Sonny.
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Old 06-02-2020, 08:20 AM   #2
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I always use polyester resin and glas to mount anything to the shell.
I've never had a problem with this method and is how the manufactures
do it, or at least did it on my boler and their stuff is still holding 46 years later.
Post 149 in this thread
https://www.fiberglassrv.com/forums/...r-55601-6.html
is an example of attachment.
Fred
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Old 06-02-2020, 10:45 AM   #3
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Thanks Fred.
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Old 06-02-2020, 11:30 AM   #4
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Was 'glas' a typo?
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Old 06-02-2020, 12:16 PM   #5
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Name: Vanessa
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I’ve read up on this too. Some of our plywood had water damage. There’s a lot online re bonding wood to fibreglass...
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Old 06-02-2020, 10:52 PM   #6
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Quote:
Originally Posted by sonny75 View Post
Was 'glas' a typo?
Ya the fiberglass mat used in the process.
Check the pics in the link
Fred
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Old 06-03-2020, 12:26 AM   #7
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Fred is obviously very talented with Polyester and fiberglass.

But if you want a simple way of gluing plywood, or hardwood blocks to fiberglass, you can simply use a one part polyurethane like 3M 5200. This bond will be stronger than the wood or the fiberglass and is as easy as squeezing it out of the tube. The wood can still be soaked up with resin or glassed over later if desired. Another good choice is Marine Tex epoxy. It is a two part white putty that also bonds stronger than the wood or the fiberglass.

Here's a link the the 5200:

https://www.3m.com/3M/en_US/company-...3241623&rt=rud

I used a lot of this on my fiberglass boat to mount bulkheads, cabinets, or wood blocks to screw into. It retains a bit of flexibility, so you can glue the edge of a bulkhead to the hull and not have too much of a hard spot that adds extra stress.
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Old 06-04-2020, 12:55 PM   #8
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Thanks for the advice
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Old 06-10-2020, 06:52 PM   #9
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Name: Sammy Joe
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When I do custom boat restorations I have been using PC-11 epoxy adhesive Paste .i like it better than Marine Tex ( except if it has to cure real fast ) it has a 20-30 minute work time but does take overnight to cure. Then it is easy to sand ,form and paint as well as being 1/4 price of Marine Tex. You can also use it if there’s water present and it’s waterproof so works well on bottom of doors. Just my 2 cents worth.
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