[PSUBS-MAILIST] Zinc coating

[Cliff Redus via Personal_Submersibles]

At our 2011 PSub convention, one of the speakers was Rick Gallenberger from Sherwin Williams.  At the convention, we ask Rick, who is a marine coatings expert, if he could put together a recommendation on a coating system for a typical steel hulled psub and he did.  Attached is his recommendation.  It is pretty much what Scott has done on Trustworthy.  
Jon, I am not sure this ever got posted to the PSub site but  I think we should added under resources some where as this is an ongoing issue with anyone building as psub.
Cliff


      From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, May 1, 2015 8:14 AM
 Subject: Re: [PSUBS-MAILIST] Zinc coating
   
Hi Brian,
There's lots of dirty, noisy, or smelly jobs building a sub, but sandblasting our little hulls - in particular the inside - has to be right at the top of the list. Years ago I bought myself a sand blaster with the intention of doing this job myself. Very bad idea. It was a complete pain, especially recovering the sand to pass it back through, which required one to pass it through a sieve to remove any kind of foreign particles that would clog the nozzle. I had clogs pretty much all the time, sand everywhere, and ended up taking the sub off to have someone with proper facilities deal with it. I generally tight-fisted, but sand blasting is THE job I don't mind outsourcing.
Best,
Alec
On Thu, Apr 30, 2015 at 9:25 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



All, Ok, I was going to take my pressure hull ( it's finished , BTW) down and have an outfit zinc coat it but now I'm thinking that I should spend that money on a heavy duty air compressor and a sand blaster and do it myself.  Since I'm sure I will need to be recoating places where I'm doing thru hulls and such.  But my question is do I need to worry about the compatibility between the zinc coating and the epoxy that will on over the zinc ??   Should I put the zinc on the inside too ?   Are there different types of zinc coatings?    Brian
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