How To Seal Acrylic Paint: Using Foam Brush and MinWax Polycrylic Protective FinishPour a small puddle of polycrylic in a corner of the painting.Using the foam brush work the sealant outwards from the corner. Continue until the whole painting is covered evenly.Clean the brush and dry thoroughly between coats.
InstructionsMake sure your acrylic painting is dry before applying the varnish sealer.Apply the first coat of varnish with a wide base coat brush. Wait for the first coat to dry.Apply a second coat going the opposite direction of the first coat.Wait for the second coat to dry.
It is essential that you varnish your completed acrylic paintings. The varnish will protect the painting from dust, UV rays and yellowing. The varnish will inevitably cause a glare if light is flashed upon it, making it difficult to photograph. I always photograph and/or scan my paintings before varnishing.
Acrylic paint can be sealed on outdoor surfaces with polycrylic or water-based polyurethane. To avoid damaging your paint, make sure you choose a water-based (not solvent-based) polyurethane.