2) brush paint does not operate quickly, repeatedly brushing too many times would have to bite the end phenomenon.
3) is not completely dry primer coating, paint solvent can be easily dissolved by primer softening, bite the end.
Two, 4 times before and after the coating is not complete.
5) for oil film and drying oil modified some synthetic resin film not the highly oxidized and polymerized before, once met with strong solvents, primer coating will be eroded. Phenolic paint such as primer and finish to use lacquer, lacquer solvent will to oily phenolic paint to bite, and primary attached at the grassroots level separately.