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Posted by D Sherman [72.47.9.228] on Tuesday, December 07, 2010 at 11:35:10 :
In Reply to: Re: So Ill take that as a CON to powder coat?? posted by MoparNorm [71.110.251.13] on Tuesday, December 07, 2010 at 11:22:15 :
From what I can tell, rustoleum changed to a polyurethane formula for everything except the red oxide primer. I hate the new stuff. Once you've opened a can of it, you better use it all pretty quickly or it will gel up in the can. It used to be that a half-used can of paint would get a skin on it, and you could peel the skin off, and what was left would be fine. Or if it was a bit too thick you could add add a little paint thinner. Now, the whole mass gradually thickens and gels up. If you try to thin it to make it brushable it won't dry properly. Polyurethanes "dry" by absorbing moisture from the air rather than by the solvent evaporating, which is why they solidify all the way through like this. The other problem with the new rustoleum is that it doesn't cover very well. Even the flat black requires two brushed-on coasts to cover the brush marks, which was never the case with the old formula. I'm sure they changed the formula to meet California VOC requirements, I wish they'd been honest about the change and clear about the properties of the new stuff. It's really an entirely new paint.
The key to identifying which is which before opening the can is to look at the flammability warning. If it says "Warning: Flammable", it's real solvent-based oil paint, probably an alkyd enamel of some sort. If it says, "Warning: Extremely flammable", it's a lacquer. If it says, "Warning: Combustible", it's polyurethane. Polyurethane is okay if you start with a fresh can and use all of it at one time, ideally by spraying rather than brushing, but it's way different from what we're used to as "Rustoleum" or any oil paint in a can.
For MV paint, Aervoe is still a traditional oil formula, while Gilespie, which is more widely available, is a polyurethane. A good industrial paint supplier can mix you up an alkyd enamel in any color you want. Ask for "tractor paint" or "equipment paint". It's thinner than Rustoleum because it's designed for spraying, but it covers well and is easy to use.
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