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Expert's Corner — oak

TIP: Linseed Oil and Polyurethane

bob bond flexner linseed oak oil polyurethane pores seal

I’ve heard it suggested that linseed oil (raw or boiled) should be applied to wood floors before applying oil-based polyurethane. Various reasons are given: seal the wood, establish a better bond, or add color. Doing this is risky, however. Raw linseed oil can take months to dry. Boiled linseed oil can take a week or longer deep in the large pores of oak. If you apply polyurethane before the linseed oil is thoroughly dry, the linseed oil and polyurethane will mix right on the wood and create an oil/varnish blend, which will never get hard. It would be like brushing...

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