Humbrol Maskol 28Ml Bottle Maskol is a rubber solution that can be applied to surfaces to prevent them being painted. It's ideal as a liquid mask - making sure paint does not get into curved lcoatoins or around gaps in masking tape. When the paint has dried the Maskol can be simply peeled off. Common plastics used to manufacture model kits including polystyrene and ABS and a wide variety of other applications including glass. Application: Brush only. Apply to surface, allow to dry and then paint over. When the paint is dry peel off the Maskol. Drying Time 15-20 minutes. How to Clean: Wipe away using a damp cloth.