RE: Fwd: [PSUBS-MAILIST] Paint...zinc primer

["Greg" <greg@precisionplastics.com>]

Hi Jon,

Many people have used zinc primers on steel and opinions vary depending on
who you talk to. I personally think that it is sort of like painting a
galvanized scuba tank. To me, zinc is an anode and should be used as a
"stand alone" coating. I save the zinc for bolt heads.

Here's is a link that talks about zinc primers on steel (bottom of the
page).

http://www.epoxyproducts.com/zinc.html

Greg




-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Tuesday, May 08, 2012 1:05 PM
To: personal_submersibles@psubs.org
Subject: Re: Fwd: [PSUBS-MAILIST] Paint.....Cheap or Proper?


The zinc coating is an interesting point.  I've talked to a couple 
people about this and gotten some different viewpoints.  The vendor I 
have targeted to sandblast the K-600 also has thermal zinc spray 
capabilities to coat the sub with zinc prior to painting.  For those not 
familiar with it, thermal zinc spraying is an alternative to hot-dip 
galvanizing for materials that are too large to hot-dip.  It looks like 
an oversize mig welding head and in fact uses an arc to vaporize zinc 
wire and then blow the molten zinc onto a metal surface via compressed 
air.  It is definitely inferior to the hot-tip process but does offer 
protection beyond just paint.  I'd be interested in any pro/con opinions 
on whether I should include the zinc coating as part of the finish.

Jon





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603-529-1100
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