Why not cure the cause of the problem?
Sticking slugs are caused by oxidized paint in the track. Chemical stripper completely eliminateds the problem but may be a bit extreme for the squeamish. I stripped and machine finished (sanded with coarse paper on an orbital sander) both mast and boom. No more bubbling paint or sticky slides.Alternative might be to scrub/polish the track with Scotch-Brite to get rid of the oxidation layer.If you insist on lubing, you want to use dry teflon spray. It is Teflon powder in a very fast evaporating carrier. I've seen it in Lowes for under $%5.00. Spray it on, the vehicle dries up, leaving the Teflon. When I was doing it it would last for the best part of the season. I made up a rig consisting of a couple of slides, bailing wire, rubber bands, halyard and downhaul which allowed me to run the can up and down the mast while the can was spraying. worked OK.