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It's really easy. You take a very small amount of the powder and mix in about a teaspoon or two of mineral oil and then just paint it on as thinly as possible.

I understand the OP is looking for a Crayon CrOx but I just wanted to throw this into the mix. For $3.00 Larry at whippeddog.com will send you enough CrOx powder to last you a life time and it works...