Whether I use Tamiya’s Acrylic Lacquer or Mr. Color’s Lacquer I only thin them with Mr. Leveler 400 with retarder already added. For hand painting basic colors, especially gloss, I use Tamiya Acrylic Lacquers. I mix and shake up the bottle as the bottle top is usually my paint cup. To that I add 1 drop Yellow cap and one drop Tamiya retarder. I don’t use the Mr. Leveler for thinning hand paints as I have to order it online, while I can get the Yellow cap and retarder locally from Hobby Lobby.
Tamiya’s Acrylic Lacquer paints have a different base then straight lacquers. Either one works perfectly for me as my go to air brush paint line. Other then the smell where Mr. Color is King, I just don’t see any difference in application, wet sanding, polishing, and waxing.
My reason for having both is that I get most of my paints and supplies from Sprue Brothers or ScaleHybbyist.com, so if I can’t get what colors I need in the Tamiya line, then I try for the Mr. Color line to fill my needs. Also Mr. Color has a great selection of Metallics that Tamiya doesn’t have.