I am oredering Menz Power Gloss for my brother in laws 1989 red chevy truck (without a doubt the worst oxidation/scratches I've ever seen)and was wondering if I need to purchase Menz for the next polishing levels or is it O.K. to use the XMT line which I already have (all but #4). Money is a concern so if I dont have to get SIP,IP or Final Polish that would be great, but I am concerned about compatability. Thanks so much.