Foam Brushes 4 Piece Polyurethane foam Clean with: Water or white spirit Size: 1’’,2”,3” & 4” single brushes Rustins Foam t Brush Set Wooden Handle 4 Piece Set | R120004 Rustins Poly Foam Brushes are an alternative to bristle brushes, the poly brush is ideal for t,wood dyes, oils and varnish. Quick and easy to use and clean, they leave no brush marks, and are suitable for both water and oil based products. (Not suitable for use with shellac or lacquer)