[PSUBS-MAILIST] Zinc coating

Fri May 1 23:16:09 EDT 2015

Hank ,  The compressor has a max pressure of 150 psi and a tank of 30 gal,  but it can only maintain a cfm of probably 80.  I got a fairly large blasting reservoir unit that is probably around 20 gals or so.  It's ok if I can't blast the whole side of the sub at once, I'll just go at the pace the unit can handle.  I've got this really hard slag in places where they formed the hemispheres, from the heat.  It's as hard as diamond !  If I hit is with a slag hammer it pops of, but in very small sections.  I tried grinding it and all it did was polish !  It'll come off but slowly.  I'm going to experiment with the blaster tomorrow.  I might try and rig a scuba facemask for back in the battery compartment later.

Brian 

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Zinc coating
Date: Fri, 1 May 2015 17:38:29 -0700

Brian,
What size compressor did you buy?  Sand blasting is a dirty job, but I love it, I find it relaxing.  Get yourself a good hood that has an air feed.  I did not know that silica sand is dangerous, that is all I use but I wear heavy coveralls and gloves.  My system is 80 cfm at 80 psi and that seems plenty.  I never reuse my sand because it looses bite and like Alec says, it will plug your tip, but not until you have crawled inside a tight space and got comfortable :-)
Hank--------------------------------------------
On Fri, 5/1/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Zinc coating
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, May 1, 2015, 7:55 PM

 I
 guess I should blast my viewports as well.   Gee I made
 them so smooth ! Brian

 ---
 personal_submersibles at psubs.org wrote:

 From: "swaters at waters-ks.com via
 Personal_Submersibles"
 <personal_submersibles at psubs.org>
 To:
 Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] Zinc coating
 Date: Thu, 30 Apr 2015 20:38:21 -0500

 Not sure about yhe
 zinc coating. I used Macropoxy as the first coat and High
 solid poly as my second coat. I don't know if that
 helps, but it is what I
 did.Thanks,Scott Waters

 Sent from my
 U.S. Cellular® Smartphone

 -------- Original message
 --------
 From: Brian Cox via
 Personal_Submersibles
 <personal_submersibles at psubs.org> 
 Date:04/30/2015  8:25 PM  (GMT-06:00) 
 To: PSubs
 <personal_submersibles at psubs.org> 
 Cc:

 Subject: [PSUBS-MAILIST] Zinc coating 

 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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