Almost always formulated with a linseed oil carrier, interior oil-based stains form a thick ... stain but a clear film-forming finish. Varnish is a broad term, referring to any wood finish ...

But if it gets damaged, he says, "repairing that thick, plastic-like layer isn ... The specifics for poly: A clear, fast-drying finish that, unlike polyurethane and varnish, doesn't require ...