Why not use salvages or long thin strips cut off when squaring up a piece of fabric. Just wrap it around the fabric and make a slip knot. I use for my cookbooks that the spirals have started to breakdown. Keeps pages from being lost.

Thanks everybody for the replies. I've taken my pins and have done the salt water spritz/soak for the past three days and no rust has come up. I'll probably feel better just leaving them out though. If the mini bolts get to be a pain unrolling, I'll pin them and keep an eye out!

I have a couple of old fabrics that the pins rusted even in the comfortable climate of So CA. I purchase the clear vinyl cloth that is sold on the roll and cut them into to strips and wrap it around the fabric. Sometimes it will cling to itself and other times just a tiny piece of tape to keep it in place.

Ifound plastic clips that you might find on new shirts that are folded. They look a lot like plastic bobby pins. Found online and they cost less than $20 for 1000. I googled plastic fasteners ; unfortunately I don't remember the name of the company.

i use plastic paper clips from wal mart

Those boards are great, I've had mine done about 5 yrs. I'm using cheap dollar store pins & some of my good pins. Never thought about them rusting. About one third of my fabric has not been used since I put it on the boards, no rusting issises. I also run a de-humidfier all year long, that might be over kill.LOL.