Osmosis prevention/treatment

[benri]

Is it possible to apply an anti-osmosis treatment (gelshield) after antifouling or do you need to remove all the antifouling?
When I bought the boat they told me that the gelcoat has some sort of treatment and I didn't need to do it but now on second thoughts I'm thinking of rather being safe than sorry!

[The_Gaffer]

Not only do you have to remove any anti fouling previously applied to the hull, but if you intend to apply a water barrier to a hull that has been previously treated, then it is recommended that you also remove the previous coat/s of water barrier.  There are products which will help you remove both the antifouling and the previous coating/s of water barrier.

[skip]

Benri I think at this stage you are probably too late and it will be a big hassle and expense. Did you clarify with Hi-Tec what the warranty was on the hull against osmosis?

[sirena]

clearly right , i've done that treatement on my boat i had to remove anti fouling then i slightly sanded the gelcoat afterwards i applied the treatement , consisting of epoxy the primer then the antifouling  thus cost me many many money and time

[benri]

Skip I haven't clarified.... in fact it totally went out of my mind and I'm only remembering after I saw The_Gaffer's post in another thread. What type of expense do you mean... to get the antifouling off or to apply the gelshield?

[Perla 165]

To get off the anitfouling you will use a " paint remover ". Then when you don't have piants suc as antifouling, primer, you have to sand the gelcoat with a  raff sand paper, that the gelcoat cames "matt". Then you have to aplicat the epoxy for 2/3 times coats. I had already do that job on our perla. Important to sanded good its not easy m8

[shanook]

mine had 3 coats of water treatment and 2 coats of primer and 3 coats of antifouling total cost (did it all myself mind u about 8 years back approx Lm300. Probability that costs have gone up not down.Also u have to dedicate 5 consecutive days as the manufacturer stats that u only wait 24 hrs max between coats, otherwise adhesion wont be to the max.
Benri check with HI Tech and follow their advice.

[Perla 165]

yep that sure shanook about time between coat and another... Epoxy that we use is (if im not going wrong) 32.15 e. It's will be a Lm15. If you like more specific info benri, go @ Camilleri Marine Centre ( gzira in front of the garden ). The staff is really nice and helpful..

[benri]

thanks for all your advice mates!