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I've had the same problem in the past, especially after overdoing a retouch varnish following a long painting session.
I tried the organic solution, which consists of scrubbing an onion over the previous layer, and it works surprisingly well for grab and adhesion. I also found there are a few mediums that will yield 'bite' when laying down the next layer of paint, as well as providing a more desirable feel and (I am told) increase the mechanical adhesion between layers of paint: Canada Balsam and turps scrubbed thinly, Canada Balsam and oil scrubbed VERY thinnly, and even Maroger did the trick when a light coat is scrubbed in and allowed to sit for a short time. I imagine a number of alkyd-based mediums exhibit similar characteristics. Anyone know for sure?
Minh Thong
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