Originally Posted By DarkCharisma:
You don't need to sand it down to metal. Just scuff the clear real good with a red Scotchbrite pad so it has something to adhere to, clean it real good with dish soap and water; wipe down or let air-dry, then put down your liner.
Buy one of those paint edger things on a stick and buy some adhesive sand paper. Should get you off your hands and knees. I am sure you can come up with something just as easy for the slots.