[TowerTalk] Experience with Sacrificial Zinc?

[Richard Smith]

 Hi John,
On Aruba, did you have any trouble having the Brite Zinc adhere to various HDG parts? We have been using Brite Zinc as well on Bonaire, and it seems to adhere to some parts very well, but flakes off easily from other types of parts. These are all new parts with no corrosion. We were wondering if there is a surface preparation step that might help with adhesion, or maybe just cleaning better before painting.
73, Rich, N6KT

    On Tuesday, August 10, 2021, 02:50:49 PM PDT, john at kk9a.com <john at kk9a.com> wrote:  
 
 I have had very good luck with Brite Zinc cold galvanizing paint in normal
environments (i.e. not the ABC islands). Even galvanizers use cold
galvanizing paint to touch up missed areas. I do not believe that it is
meant to be applied over rust. You should either clean the rust, use a rust
neutralizer or a rusty metal primer first.

John KK9A 


Donald Chester k4kyv wrote:

I had very poor outcome with zinc enriched paint. I painted over some rusty
spots on outdoor hardware years ago with stuff called "Cold Galv", and rust
began to peer through the paint in about a year. That paint is no substitute
for real galvanising, which works by *galvanic* action, meaning the zinc is
in direct electrical contact with the metal it is protecting.  The zinc
particles suspended in enriched paint are insulated from the base metal by
the body of the paint, which if not a good insulator is at best a poor
conductor.


Don k4kyv

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