Q: Is it wise to wipe the freshly sanded hardwood floors down with linseed oil before the polyurethane? The floors had a lot of stains and several different chemicals were used to remove them. I was told by using linseed oil that would seal the wood so there would not be any chemical reaction with the polyurethane Is this the solution to do?
A: If someone was trying to remove stains they likely used oxalic acid. A light rinse with water and baking soda is all you should need. I would not use linseed oil as a blocker.
There are coatings from companies like Poloplaz that could be called blockers, if needed.