Oil based wood grain filler has been increasingly difficult to locate as it is being displaced by water borne products. Although the water borne products seem to work under many top coats under lacquers they sometimes swell when the top coat is applied and shrink as it dries. Oil based fillers will remain stable and still remain the choice of many fine woodworkers. The filler is natural in color but can be dyed for use on darker woods with an oil based stain. A grain filler should be used on open grained wood such as ash, mahogany and possibly some alder. It should not be needed on close grained woods such as maple. The 1/2 pint quanity should be enough for three or more guitars.