Thanks for the video link Wade. I watched it (and remembered why I don’t care for many YouTube videos) and yes, that Ultimate Airbrush Products Ultimate Airbrush Thinner does work. But I guess the only way to get the stuff is to order it from the UK. I can’t find it available here in the US by Google or Amazon.
So I will still need to give the Vallejo thinner a shot, and of course there is always the old fallback of windshield wiper fluid.
A pox on the house of Rustoleum for discontinuing all of the Model Master products! 
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