I'm building a DML and a Tamiya Tiger II right now, The DML is the new incorrectly named Porsche turret version. I had put some zimmerite using regular Milliput and I was not happy with the results so I sanded it off and redid it using a two part zimmerit putty I got a few years ago from RJ Enteprises. I used the rake piece that comes with the Cavalier zimm set I'm using for the Tamiya Henschel turret version. It's small but it works and I'm really much happier with the result this time using this putty and rake. Using a rake and the Tamiya tool like in the recent Military In Miniature Tiger specail is from what I've read not strictly technically correct. Rakes weren't used in real life on the real tank- each crevice was pushed into the zimmerite paste to create the pattern. However- in the scale model wrld it seems to look okay and its easy so for this build I will use the rake technique. Here are som pics of the veriouys versions and processes. The last pic is of a scratch built snorkel device that was on the very early versions of the Porshe turret . It may not be perfect but I'm happy with it.
The first attempt with the regular Milliput- it's too thick in my view and too round and puffy lookin'...
sanded turret...
new zimmerit

I used the Caveleir zimm as a reference in look and depth/shapes ect. It cam out pretty close.
snorkel...