My old standby for any kind of stickies (like today, I'm using press-n-seal for quilting an intricate design) is "SEWERS AID." It's like a silicone and is sold in a little bottle on a card, looking similar to Fray Check in size and appearance.
Looking at the card back I find it has many, many uses only a couple of which I've tried. I have to start reading labels more. Here are some of the things they suggest using it for:
--Apply to spool and bobbin thread to lubricate the thread guides and tension as it passes through machine for smoother sewing.
--Apply to machine needle for smoother sewing ... knits and sheer fabrics can be sewn more easily and it helps prevent skipped stitches.
--Apply to hand needle for easier penetration of fabric when hand sewing.
--Apply to bottom of presser foot and other attachments to glide over fabrics more easily.
--Apply to scissors for easier cutting.
--Use on stubborn metal zippers and for cleaning your eye glasses. (Who knew?!?)
... I'm off to find all my scissors and give 'em a shot!