I generally use their MM paint, either enamel or acrylic, but I also have a number of the square bottles and hate to pitch them. The MM enamels I've thinned with lacquer thinner or turpentine, and it worked just peachy. I know from experience that lacquer thinner turns the square bottle paint to cottage cheese. I tried a brush full in some turpentine, which dissolved easily enough, so I know they were basically solvent-compatible, but the paint and turpentine seperated fairly quickly, leaving the paint residue at the bottom. I was trying to do a wash with it, and the results were the same on the plastic surface--seperation of paint and thinner. Are the MM enamels and square bottle enamels a different formula (one alkyd enamel, the other...?)? I'm open for suggestions.
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