Dark Hardwood Floor Filler. Wood filler is designed to act like a caulk. Whether it is a stunning hardwood floor, a stylish outdoor deck, or a beautiful set of wooden beams, cracks are bound to happen. Dries hard and won't shrink or crack.
It becomes waterproof after it dries. Dries hard and won't shrink or crack. I found them on amazon (my favorite shopping site).
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Therefore, it does not need a topcoat. It becomes waterproof after it dries. It can be used to fill in the cracks on wood surfaces to prevent further damage and hide unsightly. The finish on the edge of this board was cracked by a flooring nailer that wasn't used correctly.