Rustins grain filler 230g rustins grma230 this 230g tin of grain filler from rustins is supplied as a paste which is thinned with white spirit for use it is applied to wood before finishing to fill the pores preventing sinking of the finish the natural shade can be thinned with rustins wood dye so that filling and staining can be carried out in one operation rustins grma230 grain filler mahogany 230g