can some one tell me how to sheath ply hull with epoxy fibreglass and then gel coat

T

tdrummond

Cadet
Joined
Aug 2, 2011
Messages
15
i have a 17 foot ply hull i have sand it back to bear wood and it has dryed out the next step will be to glass it so what do i need to know? can some one tell me the full procedure
do i need to under coat to protect the ply?
what weight cloth and how many layers ?{the hull is solid do i need to use streght grade cloth?}
whats the best kind of epoxy to use?
do i need to sand between layers?
and whats the best way to apply the feathering compound and how many coats ?
the next thing is gel coat i have been told gel coat is polyester and wont stick to epoxy is this true?
what is the procedure to apply gel coat?
as you can tell i need help so please i realise that the job is a big one but i have time and the willing me and my 3 year old son are having hours of fun with this project and need to get to the next step thanks tony
 
Woodonglass

Woodonglass

Supreme Mariner
Joined
Dec 29, 2009
Messages
25,929
Re: can some one tell me how to sheath ply hull with epoxy fibreglass and then gel co

Welcome to iBoats,

First off, if you use Epoxy, and you should on a plywood hull, then gelcoating is out. Gelcoat is a polyester based product and does not adhere well to epoxy. With special prep it MIGHT work but IMHO not work the effort or risk. So you should know going in that you will probably be painting the hull. Glen L Boats has some great information on this subject. You should google them up and check out their forum. http://www.glen-l.com/methods/plywood/mthdpw01.html and this one
http://www.glen-l.com/how-to-fiberglass-a-plywood-boat/
This site will help you with supplies in your area... http://home.clear.net.nz/pages/grantglazer/Kayak/Materials.htm
I'd definetly recommend precoating all the plywood with epoxy. An 8 oz cloth should suffice. Light sanding between coats is recommended.

WelcomeAboard.JPG
 
7

74bayliner

Chief Petty Officer
Joined
Aug 23, 2011
Messages
607
Re: can some one tell me how to sheath ply hull with epoxy fibreglass and then gel co

I know its kinda hard to swallow.. it was for me.. I dont think "Drying out the hull" will help, it will for the top part of it, but if there moisture it is probably also rotting from the bottom... it will evetually rot inside out. I had to tear my floor up.. infact thats what i will be continuing today you can see in my thread.
 
T

tdrummond

Cadet
Joined
Aug 2, 2011
Messages
15
Re: can some one tell me how to sheath ply hull with epoxy fibreglass and then gel co

thanks seaman i have already pulled the deck and cheeked it out the inside is all good did that first to find out if it was wroth the efort to rebuild it when i say dryed it out i mean if there was any moistuer in the hull it has gone i found there was no foam in the old girl so will have to do that as well this is my first boat so im loveing the hole prosses
 
7

74bayliner

Chief Petty Officer
Joined
Aug 23, 2011
Messages
607
Re: can some one tell me how to sheath ply hull with epoxy fibreglass and then gel co

Same here if you look at my progress i started pullin the foam yesterday. Good luck on your project :)
 
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