Dulux trade clear gloss polyurethane varnish 25lperfect for a solvent based interior varnish which gives a tough durable finish it can be used over bare wood previously stained or varnished surfaces this clear polyurethane varnish from the dulux trade range can be applied to interior bare or varnished surfaces or over wood dye using a brush the low odour non yellowing varnish takes 16 24 hours to dry and will cover 16 m per litre on average