paint recommendations for galvanized steel

[12reasons]

I recently had my mild steel chainplates and tabernacle hot dip galvanized and have read that the life can be extended by painting with epoxy polyamide.

Thoughts on this?

Recommendations of the best epoxy for the job?

[hpeer]

I have looked up HDG painting, the “official” recommendations are onerous.

I have 2 recommendations.

1- AMERON 302 zinc epoxy primar seems to stick pretty well. You may still want to lightly sand to provide a “surface” for it to grip onto. You can then top coat it or leave it alone. I’ve painted galvanized anchors with this stuff.
2- Less experience with this but you might also want to try Petit Rust-Loc. it’s a urethane primarily with a very high aluminum dust content. Put on a few coats without letting it dry too long between coats. The little experience I’ve had has been good. It’s a one part paint, can be had in quart containers. Clean the top excessively or it will be forever welded to the can. Seriously.

[a64pilot]

Your not supposed to paint galvanized steel, but if you choose to do so you need to acid etch the zinc first to get a frosted appearance for the paint to bite into.
Or let it age a few years, then paint. Just like a steel roof.
Are they removed? If so how about powdercoat?

[model 10]

Use vinegar, it works great. It's the standard thing to use and cheap.

[barnakiel]

If you coat at all, I think use zinc rich epoxy. Prep as suggested by the manufacturer.


Once zinc turn gray, you must prep. The oxy layer is not good grip for epoxy.


Cheers,
b.

[MartinR]

Should be no need for painting, if well done, they will outlast you.

[Compass790]

They used to epoxy coat all the galvanised stuff used in Aucklands sewage treatment plant ( high corrosion areas )
Cant remember what they used but absolutely endorse the idea of painting HDG for longer life. Found coal tar epoxy great for bare steel underwater ( trawlermans recommendation)but no idea how it sticks to HDG

[barnakiel]

On sewage hardware it could have been epoxy tar then. Probably still available from commercial outlets.


b.

[wingless]

One of my favorite paints is Rustoleum Cold Galvanizing Compound aerosol. In addition to usage on galvanized steel, I also use this for all my below waterline metal.

[HopCar]

Pettit Rust Lock is designed to bond to galvanized steel and the time I used it it worked very well. Wear gloves! It also is a bitch to get off your hands.
Pettit | Rustlok Steel Primer