Knotting for sealing knots, resinous and creosoted timber to prevent bleeding through paint film. Sandpaper surface smooth before applying liberally over knots and surrounding area. Do not sandpaper knotting once applied. Resinous and creosoted timber should be sealed completely with 2 coats. Allow 1 hour to dry before priming. Clean brushes with methylated spirits. Knotting should not be used under polyurethane clear varnishes or water based varnishes and water based paints.  Based on pure shellac and alcohol.