Jason, thanks for the nice Message. This is going to throw you, but cheap primer is good primer when it comes to spray bombs. Just grab the stuff at Walmart. As far as canned primer,,,,don't use the stuff from tractor supply houses. Get a good sandable primer from an automotive paint supplier. Don't use napa !! Their prices are way off base. Sand the part down as best as you can , it just has to be roughed up for the primer to adhere. Start of by dusting the primer. That means drop back about a foot and spray the primer until you can just see the color on the piece. Then back off for 5 minutes and hit it again. WHY ? Because if there is grease or oil on the part , a heavy coat of primer will fish eye. If you hit it thin with multiple coats the primer will seal the trouble areas because the coating dries too fast for a chemical reaction with the oil. After you have a good primer coat, then start to hit it with more coats. Each coat should never be glossy . If it is, you are spraying too thick. After the third coat, 5 minutes between coats, let it dry for half an hour and sand it with 180-220 grit. Just enough to break the surface of the paint. This will show you where the low spots are in regards to pitting or bad body work. Repair the bad body work and just hit the pitting areas a few more times. The Cub paint has a lot of solids in it, so it will fill in a lot of imperfections. You can spray bomb primer the whole tractor with 4 cans. To paint the tractor with a final color from Cub will take 2 qts of appropriate yellow and one qt of appropriate white. It's a learning process but the Cub paint is very forgiving.
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