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Old 19 April 2013, 17:04   #1
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epoxy or polyester

A technical one please guys

I have a couple of areas on my deck which I have had to srtip back to bare plywood,
can I bond the CSM back to the deck with polyester resin or does the initial layer need to be adhered to the deck with epoxy?
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Old 19 April 2013, 17:36   #2
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Epoxy is a better adhesive and is also the better choice if you don't know what your existing grp is based on. If you know it is polyester, then polyester would be fine too.
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Old 19 April 2013, 17:55   #3
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Epoxy is much better in bonding than polyester, but if you need to laminate the area, You cant use standard CSM together with epoxy(most of the CSM grades are compatible only with polyester resin).

Gel/topcoat will not bond so well on epoxy either. I would use polyester unless serious doubts that boat is laminated with epoxy.
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Old 19 April 2013, 18:27   #4
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This is correct, I would use polyester resin. Epoxy will sometimes not be compatible with the original polyester, and new polyester resin or gel /topcoat will not bond to epoxy.

I have tried this before, epoxy is great for bonding to wood but on this application you would be safer to use polyester.

Good luck
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Old 20 April 2013, 10:36   #5
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Cheers for the info guys, much appreciated. Does anybody know the lay up of the military spec SR 5.4's epoxy or polyester?
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Old 20 April 2013, 12:03   #6
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Old 20 April 2013, 14:10   #7
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As Nos4r2 say, polyester. On mine, the deck is laminated with coloured resin(grey) all the way down to the plywood(one can say its laminated using gelcoat?), newer seen that on any other boat.

It had also a black tar/rubber like layer beneath the surface paint. Worst stuff ever to sand away...but that layer was most likely not factory made. Either it has served as a kind of a camouflage or then, no idea....
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Old 20 April 2013, 15:49   #8
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Thanks Nos, yeah mine had that tar type stuff all over the deck, I've had the whole inside shot blasted and its save so much time and also given me a perfect etched finish for applying CSM and flow coat. Will try and upload piccies
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Old 20 April 2013, 16:25   #9
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This is what I found after a bit of scrubbing and scraping so decided she deserved a proper job. Next step shot blasting
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Old 20 April 2013, 16:30   #10
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Shot blasting complete, still some prep work to do. I have sourced two 25 litre Avon fuel bladders so only want one recess for the Barrus tanks. Out with the circular saw and grinder and on with the Jasper outfit and mask!!
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