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Old Jun 20, 2010, 11:17 AM
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wood to fiberglass adhesive?

So I have a polyester fiberglass hull and looking to place a few wood ribs/bulkheads within it and a balsa deck over it. whats the "best" glue/adhesive for attaching to the hull? I will be using several coats of polyurethane over everything so I am not worried about the adhesive being water-proof

Patrick
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Old Jun 20, 2010, 11:23 AM
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Patrick, Check out thistothat.com Very handy site.
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Old Jun 20, 2010, 01:06 PM
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You could CA everything in place and then use a small batch of resin mixed with a filler (sawdust or talc) and then apply it to the gap areas. I do the same with epoxy, but I haven't glued wood to polyester yet. This is a good thread, I need an answer too.
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Old Jun 20, 2010, 01:08 PM
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Patrick, Check out thistothat.com Very handy site.
www.thistothat.com
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Old Jun 20, 2010, 02:02 PM
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Constellation is glassed with poly resin. Everything glued to the hull is done with epoxy mixed with fine sawdust from the band-saw. The spots you're gluing to have to be de-waxed and sanded. Poly finish resin raises a wax to the surface when it sets which has to be removed in order to glue to the surface.
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Old Jun 20, 2010, 05:59 PM
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I've been using a Devcon 2 part epoxy product called 'Plastic welder'. It's supposed to be formulated to stick anything to fiberglass... and it DOES!

Be warned though, it doesnt have much working time..
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Old Jun 20, 2010, 07:43 PM
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I have used CA and Testors green label with good success. Sanding is a must and I wipe the hull surface with acetone to remove any residual wax and contamination from fingers, sneezes, spilled coffee, etc. The acetone also is a solvent to the polyester so it will make the surface just slightly tacky for a few minutes which also helps adhesion. I have a 20 year old tug and the deck is still firmly in place. With the Testors its necessary to clamp the parts and allow to set overnight. Not conducive to rapid construction.
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Old Jun 20, 2010, 08:04 PM
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Old Jun 20, 2010, 08:17 PM
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Originally Posted by toesup View Post
I've been using a Devcon 2 part epoxy product called 'Plastic welder'. It's supposed to be formulated to stick anything to fiberglass... and it DOES!

Be warned though, it doesnt have much working time..
well supposedly the CA-glue doesnt have a very long working time either (10-15secs?) so that isnt an issue so much... I trust tollytime, thats whom I bought the hull from is first place and highly recomend him for that... his initial idea was CA :-)
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Old Jun 20, 2010, 10:52 PM
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West System G-Flex 655...

http://www.epoxyworks.com/25/pdf/G-flex_Epoxy.pdf

re: http://www.rcgroups.com/forums/showp...&postcount=481
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Old Jun 20, 2010, 11:07 PM
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[FONT=Comic Sans MS]West System G-Flex 655...
Totally agree!
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Old Jun 20, 2010, 11:10 PM
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Totally agree!
Yeah, I forgot all about that one. You could set everything in place with CA and then glue it with G-flex. Easy to mix and no heavy fumes. Sticks to metal, wood, and everything else.
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Old Jun 21, 2010, 02:14 AM
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Scuff and de-grease before using epoxy. "Goop" urethane adhesive for flat plates. A polyurethane adhesive like Titebond or Gorilla (foams and fills small gaps well). CA works, but is brittle and not waterproof.

--Bill
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Old Jun 21, 2010, 09:58 AM
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Wood to fiberglass...

I did a test bond to a new glass tug hull last week. I dampened (with water) a small scrap of light plywood and used Elmers new polyurethane glue (this is basically the same as the original Gorilla glue). Lightly clamped and left overnight to cure I was rewarded with a bond that I will have to grind apart. I can't believe how well it bonded. Try it for yourself, I think you will be happy with the easy process. Keep building!
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Old Jun 21, 2010, 10:39 AM
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Originally Posted by Bill Harris View Post
CA works, but is brittle and not waterproof.
CA may not be waterproof, but it is water resistant..
http://en.wikipedia.org/wiki/Cyanoacrylate

Seeing as most of our models spend so little time in the water, and the CA'd areas are (should be!) well sealed CA can be used, but as Bill mentioned, it does / is brittle in high stress situations and is likely to pull away from the hull.
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