From what I have read about POR15 it works great on rusted parts, but not worth crap on good metal.  If you are planning on using it on stuff like your new skid, I wouldn't, it will just peel off.  If your plan is to use it on your frame you'r probably ok.  Let me know when you are ready for for the SYE, I have done a few of them now and can help you out.