Resists UV attack to protect the timber. Woodworks Heavy Duty Yacht Varnish has been specially formulated for use on all exterior smooth planed timber, doors and window frames. A traditional marine quality varnish, it provides a flexible varnish film that flexes with the timber surface. Solvent Based. Specially formulated for use on all exterior smooth planed timber, doors and window frames. Provides a flexible varnish film that flexes with the timber surface. Resists UV attack to protect the timber. Application method: roller, spray gun. Coverage: 14-16m2/litre.