I use a Cotton Ball
Bill: I currently am using Teflon spray lubricant, but used silicone in the past, and both work well. Neither attacks the slugs.The way that I do this task, is to take a cotton ball, and wrap a thin wire around it, like the type of wire used for telephone connections. Then I soak the cotton ball with the spray lube, then run it up and down the groove in the mast 2 or 3 times, making sure that it doesn't dry out. I only do this once a year, before the boat goes into the water, and it is fine all season. It is on my checklist of things to do to get the boat ready. Once we chartered a 30 footer, and we had to pull the main down. If this had happened when it was windy, it could have been a real interesting time. On our boat, if we release the main halyard, the sail drops all the way down to the boom. Aldo