I don’t know ab dead blow mallet both in and out of the shop. I just find all kinds of rough tasks for it on the farm (and sometimes in the shop). The problem is that I also use the thing for disassembling joints the those rough tasks that chew up the mallet face can translate to dented work.
The solution is simple, mark one face for Rough work and one for Fine. How you mark your mallet is up to you, but I liked this.
-- Make furniture that lasts as long as the tree - Ryan