Yep silicon lubricant, looks like vaseline but doesn't melt. Apply to the inside of the channel annually with a small piece of rag that you have manipulated the grease into. LESS is more! As Dave said, always make sure the seal is not doubled back on itself when fitting and if the ends are coming unstuck re=glue them in place. I did a post some time back or PM me if you need further advice!
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