I like the product. So far it has worked well. I buy it in the quart form and actually apply it with a traditional hand brush. About a 2 inch brush works well. The main thing is you still MUST remove as much of the rust as possible. It can't work miracles. It is a inhibitor I believe more than a rust converter/transformer. I took everything that had rust down to bare metal and then put it on. Scuff it with a scotchbrite pad and prime over it. Then prep as normal/needed.
You can use a spray gun to apply it as well. I just have never needed to do that big of an area. I think a quart is about 40 bucks at my paint shop
