I agree to some extent with some reviews that this product does not seem to dry super hard. However, This did dry fine for what I'm doing. I think the slight softness might add some measure of durability. Follow the directions and apply THIN coats. I'm not preparing my farm implements for the concourse. I want them protected and looking respectable. If you want rock hard urethane primer and a mirror finish, you need to pay 5x the price and get PPG or Sikkens or Dupont automotive finishes. I still don't know if you can add top coat without sanding. The dope than answered my question said to call the manufacturer(why bother if you don't know anything?)

Will not harden, junk. I now have to strip the part and prime it again.

Primer doesn't dry. Days later, 80 degree days, and it's still soft. It's as if I floated a thin layer of putty. Some others have commented that this primer was purchased because the store was out of Rustoleum. If this is the case for you, just buy some silly putty and you'll get the same results. Garbage product.

I bought this primer as the rustoleum wasn't available. Worst mistake I could have ever made. It never dried, days later and if I went to sand it, the primer just ripples and really just sets like warm gum. I never had to chemically remove paint before, but I could never spend that much on sandpaper to save my life. Never again