The MinWax Spar Urethane is virtually impossible to remove without using abrasives. Once it's in your engraving, it's pretty much in there forever. Even some chemical strippers will not get it out of there. This is true of most urethanes. They are difficult to refinish over because they are so hard. An advantage of nitrocellulose lacquer is that it can be dissolved with acetone or lacquer thinner. Easy to remove, easy to refinish because subsequent coats will chemically bond with the prior coats. Urethanes do not exhibit this handy property.
