For years I have used the Mason Stain Co system that Vince described in an earlier response and you don't need to make up "gallons". I mix up the dry ingredients in an amount convenient for my needs and store in one container. I do add about 2% bentonite to this dry mix. I mix up the wet ingredients - liquid CMC (either purchased wet or made up by myself), antifreeze and water, and store in a bottle. I'm not as precise as Vince when making up the underglaze (sorry Vince but it works for me), I take a generous tablespoonful of the dry mix and a not so generous tablespoonful of the stain and mix, then gradually mix in the liquid (giving the bottle a quick shake first) until I have the consistency that I like. The wet and dry mixes can be stored for years - I speak from experience - and the underglazes made from them can, of course, be made up in larger batches if you are more productive than I. I do feel that the underglazes are smoother if pushed through an 80 mesh sieve - that's the most time consuming part. Joan.