This 300ml bottle of knotting from Rustins is used for sealing knots in wood and on resinous and creosoted timber to prevent bleeding through paint film. It is fast drying and prevents discolouration of paints. * Suitable for interior and exterior use * Size: 300ml * Manufacturer's part KNOW300 Knotting should not be used under polyurethane clear varnishes, water based varnishes or water based paints.