I am trying to solve a problem. Ferrous steel that I am wanting to color and protect at a coastal location. So far I've used powder coating , which is rusting thru in a matter of four months. The other piece I used colored dyes and finished it with Perma Lac a clear coat product.

This is one of the tumblers I use.

I got the idea from Barb, the owner of a hardware company in New England.

She told about having set up a whole wall of these running off one motor.