I make my own dry rubs but they always seem to clump up after a week to two and was wondering how to prevent this from happening?
You have too much moisture in the rub, which probably means your peppers were not totally dried out when you made it. Take the rub, spread it out on a cookie sheet, and place it in the oven on the lowest heat possible for about ten minutes. Then store it in a glass jar, not in a plastic bag, which is porous.
How to avoid Clumping in Dry Rubs