To slow the drying time of acrylics, spray water behind the canvas and or put a wet cloth behind your canvas. This will double the drying time of the acrylic paint. If you do this as well as spraying little water over the paint it really does extend the working time of acrylics a lot.
Tip from: Gerald Dextraze
Use a mister (like you use for watering ferns) to spray a fine mist over an acrylic painting as you're working on it. This will give you a little extra time for working with the paint before it dries.
But don't spray too heavily, or the acrylic paint may run.
Tip from: J.S.
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