Dulux Trade Weathershield Exterior Undercoat Dark Grey, developed to give longer lasting protection for exterior woodwork.Oil based with a high VOC content finish exterior undercoat is part 2 of a 3 part weather resistant and flexible paint system from Dulux Trade. Provides 8 year weathering durability, when used as part of the full Weathershield exterior paint system. This coat is Part 2, of a 3 part weather resistant and flexible paint system from Dulux Trade. Part 1 is preservative primer, Part 2 is the paint undercoat and Part 3 is the final gloss coat. Exterior Undercoat is touch dry in 1-4 hours and re-coatable after 4-8 hours. Coverage up to 16sq/m per litre, thinning is not recommended.