Frank, I have had this problem even with the enamels I use, and it usually happens if the paint is old and the solvent/paint ratio has "gone out of balance". (Time to throw it away!). The only way I have found to dry it is to leave the figure outside in the fresh air for a few hours (or even all day on the odd occasion). There just seems to be something about the breeze that drys the paint eventually.

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"The future's uncertain and the end is always near." - The Doors "Roadhouse Blues".