Timbermate Woodfiller is an Interior grade 4 in 1 Woodputty, Grainfiller, Edgefiller and Crackfiller. When thinned slightly with water can also be used as a sanding sealer. Timbermate does not shrink, sink, crack or fall out and has an indefinite shelf life. It is non-flammable, non-toxic and can be used to the last gram. The secret ingredient of Timbermate is tap water therefore containing no Acrylic, Latex or Solvents. The Timbermate formula is over 85 years old and is the only genuine water-based formula in the world proving that the formulation has stood the test of time.