No you don't want dry lube for linear bearings. You want a grease that will slip by the shields and provide good lubricant for the bearings. I tried all kinds of lubricants early on including dry film wax lubes. All were very loud when running. A good grease was the best and quietest. Mechanically my printers are almost silent, except for stepper songs.
This is the grease I use on everything, but I do thin it out a little with 3n1 oil. You don't want it to be runny just thinner.
http://www.tractorsupply.com/tsc/pro...p-grease-14-oz