I've been getting a lot of questions about what I use to smooth out my props so I figured instead of trying to explain it with words because I'm horrible at it I'd just do a small demo and show y'all.
I use this technique on pretty much every prop ever. I used it on Sakuyamon's mask and armour, Adiane's tail, GLaDOS's back piece and head piece and more.
PROS of this technique:
Easy to use
Without adding water it fills dents and cracks very nicely
Should not be used on moving parts or parts that will see a lot of stress as it will crack if under too much strain
Needs to be primed before painting to get the best results
The fumes can be bad PLEASE PLEASE PLEASE DO THIS IN A VENTILATED AREA
If anybody has any more questions feel free to send me a note or something.