My recommendation is to get Mr. Color.. they are cheaper than testors when you buy here. Also get their thinner/leveler.
https://www.scalehobbyist.com/catagories/Paint_and_Construction/black-gloss/GSI000000C2/product.php?s=3&t=1&u=1&pg=1&ppp=48&sb=stocknumber&so=a&man=GSI
https://www.scalehobbyist.com/catagories/Paint_and_Construction/mr-color-thinner-400ml/GSI0000T104/product.php?kw=mr,color,thinner
This paint thins 1:2 or 1:3 paint to thinner
Or you could buy and decant Tamiya Spray paints and/or use Tamiya acrylics using the same thinner above.