Protection powders and potions are common across many cultures. My own mentor taught me a very simple recipe:

Something Hot

Something Sour

Salt

An Enhancer

Tajin has all three base ingredients! The best thing is it is cheap, easily accessible, and you can use the bottle as part of your working.

A Note about Enhancers

Enhancers are added to make the working more potent. In general, they can be divided into a few groups:

Herbs and powders to increase potency. This usually involves ingredients such as asafoetida, camphor, cedar, or yarrow.

Items to tie it to a specific person/spirit

Items to specialize the powder. If you want someone to go away and also not talk about you, you might add something to sweeten their speech.