waxing a real is only going to make it slower...its different than skating...if a rail is sticky rub it vigorously with a piece of 2x4 or something similar
banana peels work pretty well, if only for a couple of hits. my friend swears by speed stick deodorant, but hes a bit eccentric so who knows what thats all about.
if you're hitting urban or whatever scrape all the rust off, and then wax it with whatever the fuck wax you want, and then scrape it all off with your ski. slippery as fuck. pam or any other non-stick cooking spray also works wonders and will slide like butter.