Hehe, that\'s the first time I hear that reason for using Tamiya putty. Let me know what your experiences are in that respect. I\'ve never had problems seeing details with green stuff though (but then again, optivisors do help). I do have more problems when using brown stuff, which is a darker putty. So no surprise there.
I don\'t know your background, so I don\'t know if you ever had figures go through a vulcanizer. If not, this could be interesting to look at:
http://www.miniature-painting.net/cgi-bin/gallery/gallery.cgi?action=displayt&gallery=VisionsP1
The third sub article shows greens after vulcanisation. As you can see, several are damaged even if they are in GS. Do note that shape and construction are important for the survival of the master.
GS is more flexible than Milliput and other hard putties (I imagine Tamiya\'s to be one of those). This makes that it can give more during the mouldmaking proces and there is less risk of something snapping. this does not mean that hard putty masters can\'t survive. Chances are just different. To put you at ease, it\'s usually possible to repair a master afterwards if you want.

Unless you use materials that can not be vulcanised of course.