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I know this sounds crazy but good old fashion pencil lead it's the greatest. It's graphite, works great and dosnt collect dust and muck.They were a little tough, mainly on the corners. So I put a few dabs of WD-40 on them. What a difference. Never use oil, it will collect dirt. I posted this on Facebook and also got suggestions of silicon spray, candle wax and soap. I think they will all work good.
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Sweet, I have graphite that came with some locks for my saddle bags on my Suzuki V-Strom.I know this sounds crazy but good old fashion pencil lead it's the greatest. It's graphite, works great and dosnt collect dust and muck.
Just to clarify: paraffin wax, not bees wax. so you can use a candle or canning wax.US Military zippers are recomend using wax.