I tried using conventional thimbles but I would change fingers and stab that one. I now use a leather thimble or my favorite, Curad adhesive bandages. I wear them on serval fingers, they grip and protect my finger tips a bit. I forget I have them on and people always ask what I have done to myself. I'll try the clear nail polish tip, I usually have that in the house.
I know I should change out my needle once it bends, but I like working with a bent needle, it's like having a pair of well broken in shoes to work in!