If you need to quick-dry paint on furniture or walls, use a hair dryer to speed up the process. Focus the hair dryer on the area that is drying too slowly. Keep the nozzle of the dryer about 2' away from the surface so that the paint doesn't blister. Slowly move the dryer over the wet area until all areas are evenly dried.
This technique works particularly well on a piece of furniture that you're doing a special paint finish on. Instead of waiting around for each layer of paint finish to dry, you can speed up the process and move on to the next coat of paint.
If you're working on a crackle finish, the heat of the hair dryer will make the cracks in the finish coat to be wider.