I bought the Ammo odorless enamel thinner, not exactly to thin enamel paints, but because you can use it over the Ammo Atom acrylic paints. The thinner is the same medium used in the Ammo enamel washes and filters, and these can be used directly over Atom acrylics. However, the washes often need toning down and thinning out, and that is where the Ammo Odorless Thinner comes into play. Sure, hardware store Mineral Spirits will "work" in that it thins enamels, but it chews up Atom paints. The Ammo product is more refined and not as harsh, so you can use it right on top of your paint, and not worry about dissolving or softening it.