The Vallejo range of basing products was brought to my attention by Legoburner. These 200ml jars contain a textured paste which I can best compare to gritty peanut butter. Once placed on the base (with an old knife - just like spreading peanut butter) the paste dries hard ready for painting and dry brushing. The grey pumice appears best suited to 15mm and 28mm figures. They are a great time saver and one jar will last ages. Well worth a look next time your in your local hobby shop.
Thanks for the tip Legoburner.