Help with finshing 3D printed props

[curious aardvark]

if you mean epoxy putty - poundland sells it. not so expensive :-)

The other thing you might try is ordinary gap filler. Big tubes from all good discount and pound shops :-)

Sandable, paintable and shrink and stretchable as well - so it says: http://www.poundland.co.uk/tommy-wal...t-filler-310ml

They sell actual squeezable tubes in poundstretcher as well - but they don't have a searchable website.
And all good hardware stores will also sell it.

Got to be worth a try :-)