"Painting" Stuff with Thinner/Mineral Spirits?

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dibbons

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I prepared an indoor metal door frame and it's attached hinges by scraping off the rust, cleaning with wax and grease remover, and applying one coat of Ospho. Next day, I shook/agitated and then opened a previously used 8 oz can of Rust-Oleum clean metal primer (white). I was surprised to find there was no yucky film of scum/dried paint in the can.

I applied one coat of paint on part of the door frame and hinges. I noticed the paint was flowing very readily into every nook and cranny but the coverage was minimal.

Following day I applied a second coat. I noticed again the coverage was minimal, but now it was starting to look less translucent. Then my mind flashed, and I began to wonder if I were painting with Rust-Oleum clean metal primer or if I was painting with mineral spirits that I had almost filled the little 8 oz paint can with some time ago? I need to start marking all of these paint cans before I put them away, because the memory is a fragile thing these days.

My best guess is I was trying to clean all vestiges of paint from the little can by almost filling it with thinner so I could re-use the can later. The percentage of paint solids therefore, was very small if my interpretation of the evidence is correct.

Then I got to thinking, there may be times when one may want to apply a very, very thin coat of paint (mostly thinner) on a project on purpose. I'll bet it would be super-fast drying. And it is so runny, it would at least begin to fill the hidden voids and crevices that average, thick paint seems to gloss over. Just thinking out loud and thought I would throw this out there for comments (if any).

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You shouldn’t ever reduce a paint by more than the manufacturer recommends. It dilutes the solids too much and then the paint solids can’t bond together properly. This means a coat that won’t bond and adhere to the surface properly either. Multiple coats of this thinned out material won't bond to each other well either.

It’s a recipe for premature failure and peeling of the paint.
 
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Just wondering if there is a reaction there. IIRC that particular primer is pretty darned thin....
 
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