It’s “Knot” Shellac works to help seal in tannins and block stains with a clear touch. It has all the same benefits of a shellac except it is “Knot”. It’s “Knot” Shellac can be used as a pre-surface conditioner on raw wood before a stain is applied to maintain an even, non-blotchy outcome. This is a great product for woodworking and furniture projects.