A type of coating that can harden my wood floor?

Q: I have a far amount of old barn siding and I would like to use it for a floor in a house I am building. My concern is that the wood is too soft and won’t wear well long term. Is there a hard protective coating for wood that will make the floor hard without compromising the colour?

A: Coatings do not alter the hardness of any wood. Cedar will still be as soft as cedar regardless of what is applied. You may decide the best way to deal with this wood is to first accept that it is going to get dents in it. Then a good penetrating oil finish such as Waterlox may be a good choice of finish because it is easily refreshed as the floor wears.