Everyone may know this already, but I just found out the hard way. Tru Color “brushable” paints are not really brushable. After ran into trouble I got this from the maker. “Our brushable paint was never intended to be applied to an entire model in layers - only touch-up or as a single application. Since our product is a solvent based paint that does NOT cure, applying new coats by brush over previous coats will dissolve the underlying paint and cause variations. Models should always be air brushed to get a smooth, consistent appearance, Even thin layers can be applied this way as you are not “pushing” against the paint with an air brush”
Wish I knew this before purchasing the product!