Osmo Woodfiller is a non-acryllic and water-based multi-purpose edge-filler, wood putty, crack filler and sanding sealer all in one. Unlike most woodfillers, it can easily be sanded at any time after drying, and it’s fast drying -within approx. 30 minutes on very thin applications. Non-flammable and non-toxic, heat and freeze-proof, will not crack, shrink, sink or fall out.