I use same name thinner/reducer to paint. Tamiya is an acrylic based paint and will not mix with petroleum based thinner, maybe with thinner.. Don't know. I spend a lot of money and time on a kit. Not going to blow it over not spending $9 on a bottle the same name thinner. If you will notice, Tamiya sells very few colors that are nationality or make specific. Their kit instructions only call out their brand of colors. And thats usually a mixture of 2,3 or even 4 of their colors. When it comes to RLM colors, I prefer the MM enamel line. But....I hear that 2 of their colors are swap. RLM 75 is swapped with 76 or verse visa. Will need Mikester to clarify if he isn't to busy playing with his privates after how his San Jose Sharks are dismantling my Kings. My recommendation, in the USA, for acrylic RLM color would be the Mr. Color line using the Mr. Color thinner. Might have to add Mr Color Retarder depending on your local weather traits. I use lacquer thinner for airbrush cleaner for all types of paint.