you should wash all bare metal with metal prep. its an acid wash. it cleans all the pits and spots that are hard to get to. wiping it down with a thinner just moves the dirt/dust around from the blaster. the aggregate dust left behind holds moisture and rust bubbles could show up in a year or less. if you use a 2k epoxy primer that will seal the metal and wont suck in moisture, and last for years.
Ive been painting cars and what not for 20 years. doing it this way is will cost yah but it'll last another 50 years. rattle can paint is JUNK. but is a cheap fix when you need it.
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