Ronseal 10 Year Weatherproof 2-in-1 Primer & Wood Paint protects your exterior wood for up to 10 years. You don’t need a primer either, so you can get the job done quickly and you won’t have to do it again anytime soon. Guaranteed not to crack, peel or blister for 10 years. Weatherproof in one hour. Paints up to 12m2 per litre.