+ 1 on the Unique from hornady. It also can be just rubbed in, lanolin I think. I tried Imperial, to much dents cases, tried Lee, it will rust your dies, water based. Tried a homemade concoction, a little Lees, 50% water, 50% 91% alcohol, shake it up, spray it on, let dry. Works if you have a lot of cases and spare time.
My 2 cents worth again.
Bobby