Filling small gaps in foam

[BatFastard]

I don't know if this is something people already do when using foam, but I've only recently started so this is new for me. Something I do when making pre-cast models to fill small gaps is use a mixture of superglue and talcum powder. I decided to try something similar for my foam builds but I'm using undiluted wood glue (white pva) and some talcum powder, mixed into a paste as a small gap filler. Unlke my superglue filler, it's easily smoothed with a wet finger and can be nicely sanded when dry.

Apologies if this is old hat, but I've just invented it and thought I'd share.

 

[collinE83]

I use wood glue often for sealing but not with talcum powder to make a paste. I imagine it would dry faster since there's less liquid going into the gap. Is there any shrinkage with it?

 

[Buliwif]

I use wood glue often for sealing but not with talcum powder to make a paste. I imagine it would dry faster since there's less liquid going into the gap. Is there any shrinkage with it?

Good question... I've heard of the talc/superglue trick for kits, I've never considered trying talc with wood glue. That's an interesting idea. Does it make sanding/shaping any easier? I know just wood glue alone can be a bit of a pain when sanding foam...

 

[BatFastard]

no apparent shrinkage so far - and the sanding does appear a little easier - I think having the glue bulked out gives the paper something to actualy grip against a bit more.
I only really tried it because 1. I don't have any filler to hand and I'm impatient, and 2, Car filler/bondo etc, can be pretty expensive in the UK if you only want a very small amount and pva and talc is pretty cheap and has other uses....