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even though you sanded the top its still isnt going to be perfect so when you first start sliding the rail it will be kind of slow. as you keep hitting it you will scrape off the paint on the edges where you contacting the rail and it will slide way better. i didnt wax my rail last year and it slid fine but then this year i had to file off some of the rust and then i used butchers wax which made it slide real well. its like a paste used on bowling alleys and dries hard. you could probably go to a skateshop and get some wax there too, although ive never used that. once you hit it, it will get wet and start sliding a lot better. if your worried though just get some wax and you will be more then set