Gamsol - Enamel awful; A-1 with oils

On several weathering posts I've praised Gamsol Odorless Mineral Spirits made by the very good US artist oil paint comapny Gamblin. As noted before I still believe this product is absolutely trumps when used with artist oils for any purposes - washes, filters, dot fading etc. It is the mildest solvent for that category and leaves the least footprint. (I'm sure some modelers that use turnpentine with oils think the tideline left by the solvent is part of the weathering process - it is if you want it, but it's from the solvent not the paint.) But I guess I've never used this stuff with enamels. I've gotten lazy and use a lot of AK premade enamel washes and streaking brews. Today I tried to make an enamel filter with both a humbrol and WEM color: they blended just fine with standard artist grade mineral spirit but clumped up with Gamsol. I'm not a chemist and haven't the foggiest idea why. (The label only notes use with oil paints and reminds the user that Gamsol evaporates 100% to leave no residue and they recommend using some kind of other medium in addition when making a "glaze." In art land a glaze would be a very highly thinned paint. Still don't quite get it. You'd never find this stuff in a hardware store and enamel paint is really not used in the art world - there it's oils, acrylics or water colors.) Anyway, it's lovely with oil paints. It's a train wreck with enamels. Learn something every day.

Eric