Re: [Amel Yacht Owners] AW: [Amel] Osmosis protection

Herbert Lackner

Hi Joel,


moisture measurement has been done, I got the fotos and uploaded them to


The boat is now out of the water for two weeks, but there is a thick layer of old antifouling on it that may still cause some moisture.  When we bought KALI MERA two years ago a professional measurement has been done after three days out of the water and moisture readings were too high, but when the antifouling has been removed at these spots the readings were within limit.


Measurement have now been made with


“Tramex Skipper Moisture Meter”, I do not know how realiable this is, for me it seems to be not a professional instrument.


As far as I can see the higher readings are all from the keel where the water tank is inside.


Hope that the pictures can be used for an advice, I cannot take better  ones as I am in Vienna now…


thanks, herbert


KALI MERA, SN120, Kusadasi


Von: amelyachtowners@... [mailto:amelyachtowners@...]
Gesendet: Dienstag, 4. November 2014 12:08
An: amelyachtowners@...
Betreff: Re: [Amel Yacht Owners] AW: [Amel] Osmosis protection



Yes, you have the proprietary Amel anti-osmosis barrier behind the gel coat. If your boat has been out of the water for days, use a moisture meter to sample the bottom and share the results with me. I can give you the best advice after....

Joel F. Potter


954 812 2485


On Nov 4, 2014, at 5:13 AM, "'Herbert Lackner' herbert@... [amelyachtowners]" <amelyachtowners@...> wrote:


Hi Joel,    I hope that you are reading this and maybe have an answer   (according to Bill you may be the only one who knows J )


We are now removing all the old antifouling and would like to know if the Santorin (Nr. 120, built 1995) has the same “anti-osmotic-barrier” behind the gelcoat like the SM.


The information is important to me because I would like to know if I have to put (expensive) 5 layers of Gelshield200 on the Gelcoat or not (or maybe only one layer) before painting new antifouling. 


Thank you very much,



KALI MERA, SN120, Kusadasi



Von: amelyachtowners@... [mailto:amelyachtowners@...] Im Auftrag von Bill & Judy Rouse
Gesendet: Dienstag, 15. Oktober 2013 08:25
An: amelyachtowners@...
Betreff: Re: [Amel] Osmosis protection



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 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.



BeBe, #387


On Tue, Oct 15, 2013 at 5:20 AM, <herbert@...> wrote:


dear all,

when we purchased the boat the surveyor recommended to renew the osmosis protection (put down all the old antifouling and paint it with epoxy...) when the boat is complete dry after winter storage. Has anyone experience with that? What material did you use, which tools...?

what antifouling is best for the amel in the carribean?

thx, herbert
santorin 120


Join to automatically receive all group messages.