Allbäck Chalk Powder is made from pure calcium carbonate, ground to a particular consistency, and it can be used in many different ways depending on the desired result.
Allbäck's Chalk Powder can be added sparingly to the Allbäck Linseed Oil Putty to stiffen the putty as needed. Be sure the chalk powder added is well incorporated into the putty before using.
To achieve an easily sanded high finish indoors on a painted surface, mix chalk with Allbäck Shellac Primer to the consistency of a thick, paintable primer. Thicken with more chalk to produce a strong, sandable wood filler for small cracks and holes.