Re: Painting (spray cans) Tips Needed
i hope it's not to late to through my 2 cents in as i was a painter for a for dealership for some years. this is all in my opinion....sand or grind metal spots with rust up to 150 grit, then 2 coats of primer should be fine, make them light to medium coats / not too heavy. cover everything, even the old paint , you don't want to take a chance there will be a reaction spraying the new paint. as larry said, the primer is for bonding only. if you are worried about grinder or sanding marks showing through, you could always apply more primer. depending on what primer you are using, it may need to be scuffed or sanded (use a red scotch-brite pad or 220 sand paper. if you are spraying an enamel, 220 grit should be fine. i totally agree with what was said before...tack off just before spraying 1st coat. don't rush it. a light coat is good. wait 15 to 20 minutes to put on your 2nd coat, making it a full coat and then apply your 3rd coat after 5 minutes.
larry had a great point about heating up the paint. in the old days we used to heat up the enamel in boiling water and with no thinner or reducer at all, just the hardener and spray one heavy coat only...HOT SPRAYING
jim from north van