% of styrene in polyester resin for wood bonding

[jfblouin]

Does some one have information about what is the % of stryrene to put in polyester resin for a good bonding on wood?

I think that is 10% but I'm not sure

[D'ARTOIS]

You should to begin with, never bond wood with a polyester type of resin.
This type of bonding will delaminate sooner or later.
Use Aerodux - or epoxy.

[jfblouin]

Sorry, I maybe dont use the good words. I mean about bonding fiberglass laminate on wood or laminate fiberglass directly on wood. I read something about use of styrene to dilute the polyester resin and help the impregnation in wood for the first layer. I look for Aerodux and it's look like a glue (wood to wood)

[D'ARTOIS]

No, I did understood you well: For two reason you shouldn't do it 1) using it for glassing, you do it for a limited amount of time. Sooner or later - in a timespan of 10-15 years, the bond will come loose, delaminate. Polyester on wood is not a permanent bond. Face that as a reality; 2nd reason - polyester resin is NOT watertight - Very, very slowly it sucks up water like a sponge does, it reaches the inside wood and there, the delamination process begins.
Aerodux 500 - a resorcinol Phenol Formaldehyde type glue is for bonding, not for
laminating -
Cheers,

[jfblouin]

D'Artois
Do you have a solution for the transom core?
Most boatbuilder use Plywood. But if I remove wood from my plan, I try to remove all of it.

Merci de votre patience face à mon anglais médiocre.

[D'ARTOIS]

Pas du tout! Pourquoi ne prend pas l'époxy? En cas de poly; et on laisse le bois de dans ou on change le bois. C'est le meme procès sauf l'époxy est un peu plus cher, c'est tout. En cas d'autres problèmes, n'hésite pas de me contacter.
Je ne suis pas Francais, mais je habite en France pendent un très long temps,
mainetenant je travaille à la Hollande. D'Artois c'est le nom de notre Domaine
en Dordogne. Mon 2ème père est un descendent d'ancien Comte d'Artois.
À bientot...

[Herman]

Hmmm, my French is somewhat sloppy, but for transom cores I can recommend the glass-filled high density polyurethane that seems to be common in the USA.