I do a lot of trim work. High end stain-grade trim work. The Minwax Stain Markers are my saving grace. Every corner, miter, inside and out has one thing in common, the cut end. If you don't deal with those cut ends, they will surely show. The secret is to daub a little of the finish color on the cut ends BEFORE they're installed. Voila! No more base color of the wood showing through. Couldn't do what I do and get paid for it without Minwax's Stain Markers.