I have used HOLT PRO-LUBE Silicon.PTFE Lubricant. Minimises friction and helps prevent corosion in marine hardware such as luff groves and sail slides. Travellers and Tracks Blocks and Cleats
At least thats what is says on the can and has worked a treat for me
But the cause of the jamming might be linked to the alignment of the slugs in the track. Are they loose in the luff of the sail ? Is there ablation of the aluminium / wood by the slugs ?
Almost any wax or silicone polish will help.
A wax polish with ptfe is my choice.
If you can somehow run a rag or similar soaked in polish up and down the track, it will help by cleaning out all the guano and grime.
I use a Teflon spray. Can't think of the product name and it's down on the boat. Mainsail slides up and down like a .... /forums/images/graemlins/ooo.gif /forums/images/graemlins/ooo.gif