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We tried to get someone in France to do the "hydro gommage' but we could not find anyone to do a boat as the boat would have to be put in a special part of the yard and surrounded by plastic - their enthusiasm quickly went when they realised this! In the
end we hand scraped the bottom this took seven days of hard work for two people and two days sanding off the initial grey primer with fine sand paper.
On 12 Feb 2016, at 18:32, Beaute Olivier
there are now machines that do a very good job. In France we call it "hydro-gommage" which can be translated by water-erasing. In fact, this is a soft sand blasting
with water and a special kind of sand based on sodium bicarbonate (ARMEX). With these machines, as Ian wrote, the operator can do a very accurate job, not removing any gel-coat.
Have a look at GRITCO dot FR (in english) or aerogommage dash probanet dot fr (french speaking).
Good luck for this job. Your hull will be happy and faster...
Do you think I should have the hull media blasted or hand scraped and sanded down to gel coat?
Kimberlite Amel Super Maramu #376
the barrier that AMEL spreads while manufacturing the hull is made of isophtalic polyester resin with 1-2 mm glass scales. It is put just after the gel-coat is spread into
the mould. AMEL started this process in 1987 as some boats made in Europe were starting to get "blisters" on the outside of the hull, under the gel-coat.
However, your Sharki may have never suffered "blistering". Don't use too powerful high pressure machine to wash your hull (maximum 80 bars) as this is a major cause for
starting blistering and osmosis.
Good luck for your hull works.
Great and timely information for us. We are about to take our Sharki out for anti fouling.
Bill do you know if Sharki’s built in 1980 also featured this propriety osmotic coat?
We are hauling out in Malaysia and plan to use Jotun Seaforce 90.
Any comments would be appreciated.
I had BeBe hand scraped, then sanded in 2011. The original bottom paint was an International hard paint. There was no barrier coat because it is not needed on your Super
Maramu as Amel has a propriety osmotic coat beneath the gelcoat...
I have always used International Micron 66 or Micron 77. I do not believe Micron 77 is available in the US or any country influenced by what the EPA allows...I have seen
it here in Martinique. FYI, the EPA has not approved a single new bottom paint in the last 7 years (politics). Micron 77 is better than 66 because you can take 77 into fresh water...77 becomes inert after too much fresh water.
Did he actually use sand or another media?
We had the bottom of Pen Azen dry sand blasted with a machine operator who was millimetre accurate. When he finished the gelcoat looked as if it had just come out of the
mould. You wouldn't think it had ever been painted.
We put two layers of clear epoxy on and then we Coppercoated.
Ian and Judy, Pen Azen , SM 302 Greece
I was thinking of having the bottom of Kimberlite stripped and painted.
I have been using ablative paint for the last 13 years and the bottom is no longer fair, regardless of a number of heavy sandings. Has anyone had their
boats bott om and keel media blasted? Someone mentioned that media blasting will harm the gelcoat.
Also, would you recommend a barrier coat if I have the bottom paint removed to the gelcoat?
Was the original factory paint hard epoxy or ablative paint? What was applied to the keel?
Olivier, what would you recommend?
Kimberlite Amel Super Maramu #376