Undercoat Solvent-based The ideal foundation for Dulux Trade High Gloss Provides good build and obliteration Retails good 'cling' to sharp edges. Can also be used with Dulux Trade Eggshell and Satinwood, to provide surface obliteration over strong colours or poor surfaces. Best by Test Product. Colour range 17 colours plus White and Brilliant White Pack sizes 1L, 2.5L, 5L Touch dry 2-6 hours. Recoatable After 6-16 hours. Coverage Up to 17mÃ‚Â² per litre on most surfaces Thinning Thinning not usually necessary but if required add up to 1 part of Dulux Thinner No. 41 or white spirit to 10 parts paint.