The problem indeed was that the mixture was too thick. I'm working on a
piece now that uses a "TLS Varnish", or TLS as a protective finish over
partially painted surfaces. Although most of the color in the piece
comes from the color of the clay, I like the depth and subtlety that
arises from using glazes and washes to tint the clay, but permanence is
equally important. TLS diluted with diluent and lightly applied finally
worked, giving the piece a durable protective coating. Before baking,
the surface appeared moist, but not wet, with TLS. There were no drips.
Following baking, the finish was very flat and transparent. And it does
buff easily and beautifully.
Incidentally, some of the paints I used were Windsor Newton Water
Mixable Oils, pigments blended with safflower oil, but diluted with
water. These were applied over three months ago, and there has been no
reaction with the clay. After two weeks,since the TLS was applied and
cured, there is still no reaction. It's nice to have another option for
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