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In addition to fat over lean, there is another consideration that is perhaps even more important, and that is not to paint faster-drying mixtures over slower-drying passages. Liquin dries very fast, and imparts that tendency to all paints with which it is mixed. Thus it works best over layers which also contain some Liquin. The choice of pigments is a factor as well, since some dry faster than others. An excess of any medium will cause problems. Knowing what can and cannot be done with mediums is as important as choosing the right one. As mediums go, Liquin is probably one of the better ones out there, but it still must be used properly.
Virgil Elliott
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