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I have a miniature that has been put together with greenstuff used to fill some gaps. Unfortunately the greenstuff is not flush with the model - I was wondering if you can file it back or wether it is preferabl to just add more greenstuff to make it flush?

You can sand green stuff or cut with a hobby knife.

It doesn't sand terribly well, mind you. It's generally best to try and get the final finish before it cures. Harder putties (Milliput, et al) sand quite nicely, but GS is a bit too rubbery. If I over-filled a gap, I'd likely cut into it and reapply a new surface layer with more care.

i have to agree with Oadie on this one. I had to rebuild a neck joint on a space marine head to be able to reuse it (Those Mk III armor bits are too expensive to replace easily), and once the GS cured, I had to take my Xacto knife to it to trim the excess and get it clean. Sanding was not an option. The excess trimmed away nicely, though.