Number 1- workboots are supposed to get scuffed up.
If you want to fill in the gaps caused by scuffs, light your Kiwi polish on fire with a match or a lighter. Let the cake polish liquify and blow out the flame.
Pour or dob the polish on the scuffs. It will fill in. Buff it out like normal afterwards.
*see note about workboots are supposed to be scuffed up.