I absolutely hate anything made by Squad ron, I stupidly used some of their white putty to fill some gapes early in my modeling foray.

That stuff melts plastics if it's too thick! Bondo won't even do that!

1. AVES or Magic sculpt for general build up.

2. Pro Create or Green stuff for detail sculpting.

3. Bondo car putty for filling up parts(large)

4. Wave CA black for seem lines.

Sorry for the  OT rant but I killed an 80$ MG FAZZ using that crap, never again.