My EUR0.02 on this subject.
I have been sculpting figures and hence been playing with putty as long as I can remember...
I think I have used pretty much all readily available brands excluding MoriMori and Bondo.
Only recently I decided to give it a try with Apoxie Sculpt. Ordered few pounds of it.
First impression..."Oh...looks and smells like Magic Sculpt!! Dang!"
Now I'm hooked!! This stuff is FANTASTIC to work with!!
Does everything better than Milliput and Magic Sculpt which were previously my prefered brands.
My current arsenal:
1) LOTS of Apoxie Sculpt (This stuff is also fairly cheap when bought in larger amounts)
2) Green Stuff for certain specific applications (a total b?&ch to sand...so works only on more "organic" sculpts)
3) White Squadron for gap filling
4) Mr. Surfacers for minor flaws and priming
Stuff I have used in the past:
-Milliput (All grades. Sands well, but is difficult to mix to perfection and is VERY messy in my opinion. Sands OK. Poor shelf life)
-Magic Sculpt (Fairly good stuff. A tad too waxy when set and does not sand as well as Apoxie)
-Sylmasta A+B (Sets rock hard, but is very soft in the begining. Apoxie does everything better.)
-Tamiya Epoxy Putty (Like crappy green stuff in my opinion)
-Tamiya Polyester putty (Ok, but expensive here. Using Squadron instead)
I have used lots of other fillers too but none are worth mentioning. Poor adhesion, crumbly structure when set and the fact that they dry in a flash once the tube has been opened being the common problems.
Cheers,
M