Hi Carlos and Peter,
Thanks for the nice comments.. this was my first time doing a 'putty type' Zim.. and though I'm not entirely happy with they way it came out, I considered it a good learning experience.. I was way more happy with the latter applications than the beginning of the model.
I used R&J Zim It Rite for the putty... It was old stuff.. I bought it 7 years ago when I just got back in the hobby (lol what a chicken, didn't use it till now).. it was kind of hard in the early applications.. and that really bummed me out.. tough to get it very thin.. then I saw in the instructions that you can heat it in the oven.. so in later applications, I waited till the Wife was out, and fired up the oven!
This softened it up nicely!!! For tools I used some R&J stamps that I bought a long time go with the Zim.. I think they're oop now though

.. and I also used the Tamiya tools.
I think the big thing is.. don't try to work on too much at a time... try to get the putty as thin as possible (I worked mine on some wax paper, I dont' know if this helped really)... The one thing that was great about the R&J putty, was that if you kept your tools wet with water, they stayed clean.. I looked at that as being a big plus.
Anyways.. I'm glad I tried, and now hopefully I have the confidence to try on my Panther G or Stug G in the future!!!
Good luck..
charlie