I'm impressed!  I am glad you shared the process with us.  I had not hear of FixIt Sculpt so did a google search.
http://www.avesstudio.com/html/fixit_sculpt.html  It looks like a pretty cool product.   Are the final results plastic like?

Shawn, I can't say enough positive things about Aves' Apoxie Sculpt and Fixit Sculpt. (Fixit has a longer working time and is less putty-like than Apoxie sculpt, but they both have the same basic properties.)

To answer your question, no, the results are not quite plastic, in that there is 0% flexibility and it is much heavier than plastic. however, in the case of restorations, it does blend seamlessly and will bond to plastic. After cured, it can be carved and sanded, but carving is difficult because it is very hard material. I like it better than Sculpey because you don't have to bake it (it chemically cures) it has a very very low shrinkage rate (about 0.01% or something like that) and is very strong. I have dropped cured pieces that would've shattered if they had been made of Sculpey. Seriously, this stuff is strong. The only thing that I like better about Sculpey is its ability to hold detail, as Apoxie tends to self-level slightly, softening sharp details. This can be partially avoided by waiting until the Apoxie begins to cure before adding details. i just love the stuff

Nice info thanks for sharing your experience with the material.

Daryl H