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Old 01-02-2011, 08:54 PM   #1
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best epoxy wood to fiberglass?

What is the best epoxy/adhesive to affix a wood post to fiberglass? *The floor in the forward head of our trawler has had a very minor amount of give in it....not much...a guest would probably not even notice it, but I can feel it. *I am not sure if it is an after market alteration that was done but long story short, one of the floor joists for the forward stateroom/head was cut to allow a recessed fiberglass pan for a built in shower that sits below the teak grate floor of the forward head. *When that joist was cut a 4x4 post was glued to the underside of the joist and then glued or epoxy to the bottom of the hull. *Where the post meets the hull the epoxy/glue has come loose, allowing the post to move slightly and thus the slight amount of give in the floor. *What epoxy/adhesive would you use to cement the post again? **I am going to look at it some more next time I am up at the boat (we went today with the entire family and the dog so didn't have time to ponder it much) to see if I can just reorient the framing and not have to rely on any epoxy at all to hold it but thought I'd see what you all would use in an application as this. *I guess some simple 5200 would hold it, eh?!
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Old 01-02-2011, 09:09 PM   #2
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RE: best epoxy wood to fiberglass?

5200 would be my first choice.
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Old 01-02-2011, 09:14 PM   #3
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RE: best epoxy wood to fiberglass?

I'm a big fan of West System.* They pioneered this stuff and their stuff works.* If it was me I'd mix in some colloidal filler and use that as glue.* Ideally with West System you want to have raw wood that the resin can penetrate.* You coat the wood and let the resin penetrate the wood and then you mix the same resin into a paste with whatever filler you prefer and use that as a glue.* As long as you do the 2nd application within something like 24 hours it will chemically bond to the initial resin application.* Where you are joining to cured FBG all you are going to get is a mechanical adhesion so you need to rough that surface up as much as you can.* If you can't get to bare wood then you will*have to rough that surface as well.
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Old 01-02-2011, 09:21 PM   #4
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RE: best epoxy wood to fiberglass?

Quote:
DCBD wrote:

5200 would be my first choice.
It would also be my first choice if it would never have to be separated again.* If not it would be 3m 4200 because it is much easier to remove.

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Old 01-02-2011, 09:46 PM   #5
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RE: best epoxy wood to fiberglass?

5200 would be my first choice.



--------------------------------------------------------------------------------

It would also be my first choice if it would never have to be separated again. If not it would be 3m 4200 because it is much easier to remove.

Yes Don, you're exactly right. Once 5200 gets a grip, it doesn't like to let go.
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Old 01-02-2011, 11:12 PM   #6
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RE: best epoxy wood to fiberglass?

Quote:
Mike wrote:

When you say "floor" I'm guessing you mean sole?

When you say "floor joist" I'm guessing you're referring to a transverse support for the sole?


Mike
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Yes and yes.



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Old 01-02-2011, 11:20 PM   #7
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RE: best epoxy wood to fiberglass?

I guess Woodsong and I are in a league of our own! Perhaps someday I will have all this boating terminology down. For all you "experts" out there, please be patient.

Ray
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Old 01-03-2011, 08:26 AM   #8
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RE: best epoxy wood to fiberglass?

It's my former builder days...I see a horizontal support member and it's a joist, DESPITE the fact that Popeye IS my middle name!
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Old 01-03-2011, 09:05 AM   #9
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RE: best epoxy wood to fiberglass?

I would also use West Systems epoxy, thickened to peanut butter consistancy.
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Old 01-03-2011, 09:47 AM   #10
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RE: best epoxy wood to fiberglass?

Preparation matters more than what kind of glue you use. Even a non-nautical PL440 construction adhesive will work, with adequate preparation. Mike still has the best advice, live with it.
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