I need the hood and roof and maybe the trunk painted on a cheaper car so I'm doing part of the prep work to save almost half the cost. The paint is in rough shape so it needs to be stripped. I'm using the Tal-Sol II aircraft stripper and have done most of the hood in just a few hours. (Not actual time since you brush it on a section, go away for a half hour to do something else and then come back to scrape it off and maybe do a second application.) Anyway, since I’ll probably end up doing this over a couple of weekends, how should I prevent the bare metal from rusting. I don't want to spray on a primer since the stuff in the spray can isn't as good as the professional primer the body shop uses, not to mention the application isn't in a controlled environment on pristine grease and dust-free metal. I can imagine if the paint starts peeling a month later the body shop would say I used bad primer. Can I use something like WD40? I tried it on half the hood already and it seems to work great, no evidence of rust after 4 days. It comes off easy with lacquer thinner so when its time to paint, the body shop just needs to wipe it off. The car is outside and it hasn’t rained yet but I can cover the hood with plastic trash bags as I progress. Is this a reasonable idea?