[PSUBS-MAILIST] Zinc coating

[Jon Wallace via Personal_Submersibles]

Don't know the answer to this one.  The sandblaster I talked to swore a 
zinc thermal spraying protects steel better than anything else because 
it acts as a sacrificial anode.  But from what I can find out from other 
sources the zinc coating still needs to be covered by paint because 
sometimes it does not adhere permanently and it can chip.  So I have the 
option to have the hull zinc galvanized by thermal spraying but I don't 
know if it's worth the money.

The sandblaster/painter I talked to said the coating goes on one side 
only, presumably the outside because it would be way too difficult to 
get the thermal sprayer into a small sub to effectively coat the inside.

Jon



On 4/30/2015 9:25 PM, Brian Cox via Personal_Submersibles 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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