If you don't want your paint ruined, flush the system and then switch to DOT 5 brake fluid. I painted all of my brake parts with single stage urethane after epoxy primer. Be sure to clean, clean and clean some more then use DX-330 (ppg) cleaner before painting. This removes any contaminants that can and will ruin your paint. I had a bad experience where I used the DOT 5 before I painted everything. I had a leak, so silicone got on my unpainted parts. Not good times 1000. Cleaning silicon off metal prior to paint is very hard. If you think its clean, clean it again. I wont make that mistake again. Good and clean, then paint, then DOT 5 and it should be great. The usual DOT 3 is a paint killer no matter how good your prep is.