Waching paint dry
From: Edward Green (spamspamspam3_at_netzero.com)
Date: 03/28/05
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Date: 27 Mar 2005 19:25:19 -0800
When painting an old bare concrete floor with oil based enamel, it's
tempting to pour the paint on thickly enough to fill holes -- a purpose
for which it was not designed.
The paint forms a rubbery surface layer, of course, like in a poorly
sealed can, and thereafter stops hardening. My first idea was that the
surface layer was impermeable to solvents, but the problem seems to go
deeper than that. In fact the paint under the surface eventually
doesn't seem longer set normally even if exposed to the air.
The first time this happened I suspected something absorbed out of the
floor had poisoned the paint, but now I'm remembering something about
oxygen being necessary for a polymerization reaction (or is that only
artist's oils)? The bulk paint is undergoing some chemical/physical
transformation which is bypassing the hardening process. Solvent
extraction without exposure to necessary oxygen?
And BTW, does "oil-based enamel" pin down the chemical system, or is
that a catch-all?
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