Thinly painted acrylic films may be vanished after 24 hours of drying time, but up to a week of drying time should be allowed for heavy or impasto layers before varnishing. In addition, varnishes may be intermixed for a variety of finishes.
For advice on when to use each varnish, see our usage chart.
Hints & Tips on using Acrylic Mediums
Article on Varnishing Paintings