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was impossible as the paint was thick and wet
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I saw Nelson Shanks do a demo a few years back and he had the same problem, trying to add paint to a portrait that already had lots of slippery layers on it. It was in the middle of a demo so he couldn't just wait a couple of days for it to dry to add more paint.
To solve the problem he used a Damar retouch varnish spray and during a break I asked him about it. He said it was to make the lower layers grab more so that he could continue to add paint. Might be worth a try