The other guys who answered you failed to mention they don't have Tamiya tanks, they have cheap $50 junk toys ,the paint you need to buy probably costs more than their tanks, so of course they dont buy the good stuff.
Yes, true..I only use that crappy Tamiya and Testors brand paints. Perhaps you could share THE brand to use when painting a TAMIYA tank vs any other model? I wonder what the big scale guys use when they paint $5000.00 1/6th scale tigers? I wonder if the paint they use probably cost more then $500.00 junk toy Tamiya tanks? Ponderous...