A generous coverage of up to 9.8m² per litre ensures each tin goes a long way, and it can be used under any solvent-based or water-based topcoat. • Coverage of up to 9.8m² per litre. On interior surfaces, the quick-drying Cover Stain has great hiding power and permanently seals stains of all kinds - you can be confident your topcoats will be blemish-free.