I have decanted many times without issue. It may have just gotten to thick for the solvent evaporating. How long did you leave it open to de-gas? It should not take too long. Put it in a jar, or whatever, with a loose lid to cut down evaporation but allow gas to escape.
How are you decanting the paint? Through a straw or just spaying it into the jar?
Both are synthetic lacquers for plastic models with the AS being geared toward aircraft.