i have used many of the spray can etch primers the dupont 215s was used in many of the shops i work at but they do not make it any more but A-4115stm will work SEM makes some but i like the tempo A902 or 801 should do or the sherwin williams 988 etch primer i really like the 215s but not made any more so the SW i think works good have used the spray can stuff for small parts when you do not want to load up a gun