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Spray painting pottery.

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PVR

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Apr 22, 2004, 6:34:24 PM4/22/04
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Swimbo wants two pot lamps to be spray painted (She is the arbiter of taste
around here; I merely do the conversions). When I sprayed the lamps with a
lacquer there was an immediate 'crawling' effect of the paint on the
surface. It looked like a severe case of fish eyes, as if I had painted over
a very greasy surface. I removed the paint with lacquer thinner, washed the
pot surface again with the thinner, then tried a spray applied primer. Same
result. This effect is like someone had sprayed the pot with silicone
anti-foam. It is an extreme example of surface tension in action.

Can anyone suggest a primer which might not crawl on this surface?

Peter.


DanG

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Apr 22, 2004, 7:59:05 PM4/22/04
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It sounds like form release agent.

When the wrong release agent or curing compound is used on a
concrete floor that is incompatible with floor adhesives, you wash
the floor down with muriatic acid followed by plenty of rinsing or
shot blasting the floor.

You might try an intense washing with soap and water and a scotch
brite pad before the muriatic method.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing. . . .
DanG


"PVR" <pete...@adelphia.net> wrote in message
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SQLit

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Apr 23, 2004, 10:25:15 AM4/23/04
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"PVR" <pete...@adelphia.net> wrote in message
news:UuCdnf9jbJH...@adelphia.com...

Acetone, is the finish cleaner that I use because it evaporates completely.
Thinner is not a cleaner. Rubbing Alcohol might work as well, not Isopropyl
which has water in it.
Start with TSP, let dry and then Acetone. Please do this outside. Acetone is
pretty aggressive.


nosp...@vcoms.net

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Apr 23, 2004, 8:04:33 AM4/23/04
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Suggest trying Zinsser Seal Coat prior to muriatic acid. Seal Coat is
2# dewaxed shellac that is used to undercoat many finishes and sticks
to almost everything. It would be the first on my list.
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