I also use Wally World paint at times because they are more readily available than other brands in my hometown. I learned of a mix awhile back (from Snax?) that uses Ethyl alcohol,distilled water, and glycerin.The easiest way to find liquid Glycerin is in the form of liquid laxatives. The mix is: 2 parts water (4ozs.), one part alcohol (one oz.), and one or two drops glycerin. Thin paint as you see necessary. Hope this helps, it was a life saver for me.