Thanks guys,
Larry, the crester I'm using is a vintage crester made by Scheib industries in Michigan. It was likely made in the 50s or 60s (not sure). I use the testors full strength. The brush I'm using came from Michaels craft store. The bristles are soft and about 1/2" long. Keeping the paint bottle rim clean and cleaning the brush often helps but nothing is more important than straight shafts that spin true. You have to almost become anal about it.