[PSUBS-MAILIST] Zinc coating

[Alec Smyth via Personal_Submersibles]

Darn, I wish you weren't half way across the country Scott or I'd have a
little job for you!  But you're no doubt right.

Best,

Alec

On Fri, May 1, 2015 at 9:47 AM, via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I did all my own sand blasting. You can see how I did it in my project
> pictures. After messing around with different sand blasters and different
> media I learned how to do it quick and easy with minimal dirty work. The
> long and the short of it is do not use a cheapy DIY sand blaster (the kind
> that looks like a little suit case). If you do, you will spend weeks trying
> to sand blast your sub. Get a Cleamco 3/4" high volume siphon type and rent
> a towable 180 CFM compressor. I did my whole submarine inside and out in 3
> hours (including all the small parts). Use 80 grit coal slag (DO NOT USE
> SAND!!!). Get a air feed hood which works better than a respirator with the
> cheapy hood. This process is all about having the right tools. Also be sure
> you tape off / protect with cardboard, the critical parts that you don't
> want to blast. Blasting takes a smooth surface and makes it rough which is
> perfect for paint to anchor on too, but bad for seals and such.
>
> When you are done, vacuum out the sub and wipe it down with solvent then
> move it to a paint booth. Wipe it down again, paint, and be happy :)
>
> Thanks,
> Scott Waters
>
>
> -------- Original Message --------
> Subject: Re: [PSUBS-MAILIST] Zinc coating
> From: Alec Smyth via Personal_Submersibles
> <personal_submersibles at psubs.org>
> Date: Fri, May 01, 2015 6:14 am
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
>
> 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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>>
>>
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