Let your blisters completely heal up before putting the Salonpas
on them. The patches should only go on intact, clean dry skin.

Also if you tend to have cold hands, you can investigate fingerless gloves. I used them alot this summer (it was really cold at our upNorth place), day and night! I found them very helpful.
I got mine on Ebay, and they have plastic numbles on the palms to help with traction so they are not so slippery.

I'll probably start wearing them here at home in a month or so as we keep the house cool all winter.