Experts in floor care and renovation products since 1955, Dr. Schutz manufactures high-quality cleaning and care formulas for various kinds of flooring. Here you'll find their X-tra Fill wood floor filler in different sizes. Dr. Schutz X-tra Fill (pronounced as Dr. Schutz "Extra Fill") fills in gaps and cracks in a hardwood floor during sanding and refinishing. This hardwood floor wood filler blends with the wood floor's natural sawdust to create a smooth filler that fixes scratches and dents to form a smooth surface before applying stain and the finishing coat. The extra fill water-based formula will readily accept wood stain the same as the rest of the wood flooring surface. This hardwood floor filler is our most popular Schutz product. This product is not intended to fix scratches on a finished floor. Written instructions are included. Watch the video on the Xtrafil product pages to see how to use and apply this wood floor filler.