Clean the surface of your countertop thoroughly with liquid cleanser to remove any grease and dirt from the surface.
Sand the surface of the acrylic with your palm sander. Be sure to cover the entire surface of the countertop. You need to sand the surface only once.
Place masking tape over the areas you don't intend to paint.
Apply one layer of the bonding agent to the surface of the countertop with the paper towel. Wait five minutes for it to dry.
Mix the primer in the spray gun container per the primer's instructions. Put your gas mask on.
Spray the surface of the countertop with the primer. Two coats of primer will be sufficient. Allow the primer to dry.
Replace the primer container with a container of your acrylic top coat paint. Use the spray gun to apply a coat of paint. Wait 30 minutes.
Apply two more coats of paint, waiting 30 minutes between each coat. Allow the paint to dry overnight before removing the tape.