http://www.rustcheck.com/ RUST CHECK Krown evem if you get 6 spray cans or a gallon and spray it yourself. Something is better than nothing. Used engine oil contains acids collects dirt and is messy. I live in the rust bowl of North America. Backing plates on 5 and 6 year old chev trucks rust off here.
LPS3 This is one of the best. All of these products work well. The cold galanize works also
