Picked up this Bust at a car boot sale for £1 and i wanted to repair it, i've started to glue back what parts that were broken off, some are completely missing though. What's the best way to repair it?
This is with the last (and biggest) piece thats left to attach
don't use expanding foam. expanding foam has enough 'force' to push doors and windows out of square when used in the wrong places. it will expand inside the arm and break out all the pieces you have already glued back into place.
there is another type of foam (for window and door frames) that doesn't expand as much or with as much force. *maybe* that could be used. but I'd go for the fiberglass mesh + resin to re-enforce the inside then use bondo or some other sculpting material to fill in the gaps to bring it up to the final finished surface then paint.
my daughter would LOVE that statue - she's a Superman nut.
I don't know, but if you want to fill in those cracks, you can use super glue and baking soda. Rub baking soda in the cracks and drop a little super glue on it. It'll dry almost instantly and you can sand off the extra and paint it. That's something people who make plastic models often do to fill gaps.
use mesh as mentioned, then filler.
For the fine cracks, use filler primer. It's a spray, it fills cracks and builds up as you go. Sand when done.
You'll be wanting to repaint most of it so it doesn't look patchy