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I've used the Rust-oleum Hammertone paint on a few of the parts on my machine, today after painting I actually grabbed the can and read the label.  It states that it shouldn't be used on galvanized metal.  What's that all about?

Thanks,
SGM

I am guessing that the galvanizing will interact with the paint and may peel up under your freshly painted piece.
Just strip it before painting.

I have painted thousands of galvanized pieces with Hammer paint and never had any problems. I have also used them for a long time after painting and it has always worn well.

I've aslo used Rustoleums Hammertone paint on galvanized metal shelves, etc. it works very well, but you'd want to make sure that there isn't any "white-death" (white zinc-oxide) on the surfaces as it is very powdery & will cause the paint to peel & blister,

I just go over the surface to be painted with some medium OO-steel wool ( wear a dust mask as zinc-oxide is an irritant to the throat & lungs, and it's a good idea anyway regardless!) to remove any loose oxides, or the chemical method would be to use a metal prep solution such as phospheric acid (metal prep) to strip the gavanizing off of the base steel, which is fine if you can dip the parts in a suitable sized plastic tub, but it's a bit of a chore if you're trying to do tank/liner thats still in the machine. PS...Always wear rubber gloves, a long sleeved shirt & eye protection when using chemicals too!

or you can have the pieces media blasted to remove the plating too.

Yep John is right. I use steel wool and a good bath. That has always worked for me.

Something else I forgot to mention, when it comes to painting galvanized metal, the recomended (old school) method is to clean off any loose oxides & prime it with a latex primer then top coat it with the finish top-coat of paint. in fact the "Hammerite" brand of hammered finished paint has a spray-on primer, but you usually won't find Hammerite in the big-box stores ( Rustoleum rules the shelves there) but most smaller paint suppliers do carry it, Hammerite by the way has micro-fine glass particles in the mix that wears like iron, just a quick FYI.

I to apray alot of the hammertone paint. I always media blast the parts to insure proper adhesion. I've never had a issue yet!