Jeff -
The American Galvanizers Association has an excellent pamphlet
entitled "Painting Galvanized Steel Structures." You can get a free copy
from them by calling 303-750-2900. Basically they recommend the typical
approach to any painting job:
- Surface preparation
- Proper paint selection
To prepare the surface, remove all loose rust with a wire brush -- there
is no need to remove all rust, just remove loose rust. If dirt or grease
is present, clean the tower with a solvent or detergent.
You could use spray cans of zinc rich paint such as Rust-Oleum Model 2185
cold galvanizing compound or a can of Rust-Oleum brush-on "Zinc-Sele"
paint - a zinc rich paint that contains 86% pure zinc in the dried paint
film. A can of brush-on paint is much more economical than spray cans if
you have a large project! Another zinc dust/zinc oxide paint conforming
to Fed Spec TT-P-641, is McMaster-Carr's p/n 7725T2 ($22.92 per
quart) or 7725T1 (83.33 per gallon).
73
Frank
W3LPL
donovanf@sgate.com
On Tue, 26 Aug 1997, Jeffrey Maass wrote:
> My Rohn 45 is showing some signs of surface rust.
> What is the recommended paint / treatment to extend it's useful
> life? Preparation?
> Are the spray-on "cold galvanizing" of any value?
> 73,
> Jeff Maass (jmaass@freenet.columbus.oh.us) Amateur Radio K8ND
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