vic008
Active member
Went back to ply right behind the prop. Wondering do I need more layers of cloth/resin for there. Just done 1 layer of cloth
Cloth/resin right behind prop. How many layers?
- Thread starter vic008
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PCUK
Well-known member
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William_H
Well-known member
One layer of cloth IMHO on wood is not good. It will delaminate fairly quickly. You need either just wood with paint or go for really thick GRP that will in effect stand up alone as GRP with a wood mold. (as in 6mm thick at least) ol'will
Stemar
Well-known member
I don't understand that. If I'm not mistaken, there are many wooden boats that have just one layer of cloth over the wood then paint - Look at Victory, the tender Art of Boatbuilding built for Arabella, for example.
A good coat of thin epoxy on the bare wood to soak into the wood followed by the glass cloth put on while the first coat is still tacky then faired and painted should last for years. Of course, the wood must be good and dry, or nothing will stick, not even paint.
A good coat of thin epoxy on the bare wood to soak into the wood followed by the glass cloth put on while the first coat is still tacky then faired and painted should last for years. Of course, the wood must be good and dry, or nothing will stick, not even paint.
vyv_cox
Well-known member
I owned a small motorsailer that had a plywood pilothouse roof that had been sheathed with GRP, rather poorly. When I began to repair it the adhesion between polyester and ply was so poor that whole lot was easily pulled off, a couple of metres square. I redid it in epoxy, which was immovable once cured.
saxonpirate
Active member
I'd go with that.. but I note you said 'epoxy' and not polyester.. As you obviously know.. polyester is a lousy glue.. The other big factor that you mentioned of course is the moisture content of the wood to ensure a good bond, and that I believe is around 8/12%. Don't quote me on that mind, I haven't confirmed that, its just a figure I remember from my days working with SP Systems Resins..
penfold
Well-known member
Polyester doesn't stick to plywood worth a damn.
vic008
Active member
I'm thinking of the effect of the propellor turbulence(?) on the epoxy
Tranona
Well-known member
Will have no effect. I had a deadwood and rudder sheathed in epoxy glass, single layer in close proximity to the propeller for over 20 years on a previous boat with no adverse effect. don't forget you will be adding antifouling paint on top.