I have a tri axle dump, Kenworth, The chassis paint is peeling off and there is rust forming underneath. I may not be able to sand blast this, so what other option can I do. I will do a section at a time because of the large area’s, I also want to do the rears, and all other parts. I hear about the POR 15, I had used it many years ago. I also like to clean the aluminum dump body and wheels, but I also like to seas these things when im done. Can you assist me on what products to use?