Ronseal 3-in-1 Basecoat covers hairline cracks, bold colours and seals new plaster in just one coat. Easy to apply with high coverage, it will leave a smooth and durable finish, helping you complete your project in no time. Application When using Ronseal's 3-in-1 Basecoat make sure your room is above 10C, and open a window to keep it ventilated. Cold weather can stop the paint from drying properly. Cover anything you don't want to get paint over. Get rid of any loose paint or plaster by giving it a quick sand. Wipe the area you're going to paint with a damp cloth to make sure its clean and free from dust. Give it a really good stir. Then use a roller or brush to put it on. It'll be touch dry in 2 hours. Extra coats may be required when making dramatic colour changes. After 4 hours it'll be ready to paint over.