Re: [Amel Yacht Owners] Bottom paint


GrahamJohnston42 <grahamjohnston42@yahoo.com>
 

Hi Eric,
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?





Fair
Winds





Eric





Kimberlite
Amel Super Maramu #376





 
















 







 











 

















 


































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