Hand Skills
Well-Known Member
Polyurethane generally doesn't soak in. It's basically a glued on finish and will chip or Crack. Oil finishes penatrate better but generally don't seal as well.both work well...for a while.
Wood expands and contracts with moisture content which also contributes to the breakdown of bothe types.
That's what makes Tru Oil so great, it is a blend of linseed (which isn't waterproof) and Tung oil (which is waterproof), makink a finish that is both waterproof and flexible, unlike polyurethane.
It's like a light version of the old school Spar Varnish that was developed for marine use.
The othe nice thing about Tru Oil is it doesn't yellow with UV exposure.
It was originally marketed for gun stocks, but now lots of furniture builders use it - really great stuff!!