Dulux Trade Weathershield Undercoat Brilliant Dark Grey 2.5 Litres

Amazon

Flexes with the wood to prevent cracking. Provides good build and excellent opacity. Can be used on primed metal such as garage doors. Coverage:Up to 16m² per litre on most surfaces Colour: Dark Grey, Manufacturer: Dulux Trade

Zoro Tools

Dulux Trade Weathershield is Part 2 of a 3-part weather-resistant and flexible paint system specifically developed to give longer-lasting protection for exterior woodwork.

Freshlick

?A solvent-based undercoat for exterior wood and wood trimUp to 8 years weather protectionIncreases opacity and sheen