Rustins flexterior varnishes rustins fldo500 this flexterior dark oak varnish from rustins provides a quick drying satin wood finish for long lasting protection to both soft and hardwood exterior joinery ideally suited for doors window frames cladding garden furniture and all smooth planed exterior timber eco friendly with uv inhibitors the varnsih is touch dry in 30 minutes and re coatable in 4 hours rustins fldo500 flexterior varnish dark oak 500ml