Re: [Amel Yacht Owners] Bottom paint
GrahamJohnston42 <grahamjohnston42@yahoo.com>
Hi Eric,
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I can highly recommend the process of soda blasting as I have used the machinery and can say that the gelcoat is not damaged in the process. This process was pioneered by Arm and Hammer in the USA I believe. I have been at a demonstration where the inside of a desktop PC was soda blasted without any mechanical damage, I cannot state what it did to the electronics though! I see the problem with using dry and more abrasive techniques such as sand and grit blasting is that it is entirely down to the skill of the operator as to the amount of abrasion that is caused. Some operators are not so good and I have seen rather disappointing results. Wet slurry blasting is also a very effective and relatively safe technique which is quite popular here in the UK. I think that that is what Olivier is referring to. Blasting with ground walnut shell is also an effective a safe method. I am told that this is what is used on aircraft. I have a small machine for myself and I can remove paint from a substrate without any more than very lightly keying the surface ready for a the surface coating. Scraping and sanding will most definitely damage and remove some gelcoat. I have been doing this kind of work for forty years now and I would advise against it if you have the choice as making good the scratches etc. can take some time whereas with blasting a wash down and you are ready to go subject to moisture readings. Regards, Graham --------------------------------------------
On Fri, 12/2/16, Ian & Judy ianjudyjenkins@hotmail.com [amelyachtowners] <amelyachtowners@yahoogroups.com> wrote:
Subject: Re: [Amel Yacht Owners] Bottom paint To: "amelyachtowners@yahoogroups.com" <amelyachtowners@yahoogroups.com> Date: Friday, 12 February, 2016, 18:37 Hi Eric, In answer to your question, our guy used dry sand, in 2010, but even then it was disapproved of for environmental reasons. He preferred to work with dry sand but I think now everyone uses wet sand, as mentioned by Olivier. Ian From: amelyachtowners@yahoogroups.com <amelyachtowners@yahoogroups.com> on behalf of sailormon kimberlite@optonline.net [amelyachtowners] <amelyachtowners@yahoogroups.com> Sent: 12 February 2016 17:33 To: amelyachtowners@yahoogroups.com Subject: RE: [Amel Yacht Owners] Bottom paint Olivier, Thank you, Eric From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com] Sent: Friday, February 12, 2016 12:32 PM To: amelyachtowners@yahoogroups.com Subject: Re: [Amel Yacht Owners] Bottom paint Hello Eric, 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... Olivier. On Friday, February 12, 2016 6:10 PM, "sailormon kimberlite@optonline.net [amelyachtowners]" <amelyachtowners@yahoogroups.com> wrote: Hello Olivier, Do you think I should have the hull media blasted or hand scraped and sanded down to gel coat? Fair Winds Eric Kimberlite Amel Super Maramu #376 From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com] Sent: Friday, February 12, 2016 11:54 AM To: amelyachtowners@yahoogroups.com Subject: Re: [Amel Yacht Owners] Bottom paint Hello Warren, 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. Olivier. On Friday, February 12, 2016 12:26 PM, "trailz@iinet.net.au [amelyachtowners]" <amelyachtowners@yahoogroups.com> wrote: 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. Thanks Warren and Zetta Manon2 Sharki #15 Sent from Windows Mail From: 'Mike Ondra' mdondra@verizon.net [amelyachtowners] Sent: Friday, 12 February 2016 7:04 p.m. To: 'Mike Ondra' mdondra@verizon.net [amelyachtowners] Eric, 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. Bill BeBe 387 On Fri, Feb 12, 2016 at 10:15 AM, sailormon kimberlite@optonline.net [amelyachtowners] <amelyachtowners@yahoogroups.com> wrote: Hi Ian and Judy, Did he actually use sand or another media? Best Fair Winds Eric From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com ] Sent: Friday, February 12, 2016 3:10 AM To: amelyachtowners@yahoogroups.com Subject: Re: [Amel Yacht Owners] Bottom paint Hi Eric, 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 On 12 Feb 2016, at 02:10, sailormon kimberlite@optonline.net [amelyachtowners] <amelyachtowners@yahoogroups.com> wrote: Hi, 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? 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