Re: [Amel] Osmosis protection
Bill & Judy Rouse <yahoogroups@...>
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I removed all of the antifouling in 2011 on BeBe, Super Maramu, which was delivered new in Jan 2003. Gelcoat is, at best, about 90% vapor proof, so normally there is a need for a barrier coat, however, not so on all Super Maramus. Amel used a proprietary anti-osmotic behind the gelcoat which is 99% vapor proof. I am not sure if your Santorin has this coating behind the gelcoat or if it will require an epoxy "barrier coat" over the gelcoat. I believe that this depends on when the Santorin was manufactured and the resins that were available at that time. The only person that I know that can tell you this is Joel Potter.
Normally yards remove the antifouling and down to the fiberglass by scraping it off, either by hand or with an electrical scraper...sometimes a grinder. If you are not doing this yourself, I recommend supervision 100% of the time as you do not want them to damage the gel coat. Any scratch deep enough "that can be filled in the gel coat" should be filled with proper epoxy, then faired smooth.
If you do require a barrier coat, I recommend International Paints Gel Seal 200.
When you ask for recommendations for antifouling, you will get many because it seems that the product someone uses, they tend to support...human nature, people do not like being wrong. I have a friend that will pay $1,000+ to have his boat hauled then shop antifouling by price sometimes paying as little as $100/gallon...I certainly do not recommend this.
I always recommend International Paints Micron 77 for the tropics...and I use it exclusively around the world. We used Micron 66 then Micron 77 when 77 replaced 66. It will cost more than most antifoulings, but the one thing that is always true with antifouling is that you will get what you pay for. If you use Micron 77, be sure to read the product information sheet completely...do not use thinners and do not apply the layers too thick or too thin...if using a roller, you can create bubbles in the paint by using the wrong roller or rolling too fast. Read the product sheet and be an expert before your painter starts. He might think that you are a pain, but it is your boat, not his! A Super Maramu requires 20 liters.
I can walk through a marina and pick our Micron 77 users...the hulls will be cleaner. You might try this, but only if you are in the tropics. Walk through a marina and ask the people with the cleanest hulls what they use, when they applied it and the last time the hull was cleaned...that is the way to get your best answer.
Hope this helps you.
On Tue, Oct 15, 2013 at 5:20 AM, <herbert@...> wrote: