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Leave the varnish brush out to dry for 24 hours. Do not store your brush in water or mineral spirits.
Let the brush dry for at least 24 hours, or until it no longer seems damp. Avoid touching your brush, particularly the bristles, while it is drying. Moving the bristles too much as they dry can cause them to lose their shape. Although some may advise you to store your brush in a jar of water or mineral spirits, this method can warp the bristles. Keep your brush in a box instead so it stays in better condition.