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As the title says.

I am thinking of getting some for some large scale sculpting, and am interested how easy it is to work with.

Are you talking about pink/blue insulation foam? or something harder like Balsa foam?

Pink is easy to work with, but will not hold much in the way of detail - the cells in the foam are much too big. Its best used for terrain like buildings or rocks/hills.

Balsa Foam is a sculpting product. I know GF9 was creating statues for terrain using this foam.

If you are referring to Precision Board or Sign Foam, sure. I have tons of it sitting at my house. I work for a plastic fabrication company. Part of our output service is to carve and cut foam like that for sign shops w/our CNC router. Therefore I snatch all the scraps out of the dumpster.

The material is great to work with, it machines well, takes paint well, holds shape with no understructure, and doesn't warp with humidity fluctuations.

I can only think of two drawbacks; first is the dust factor. I like to use rotary tools to do my carving, if don't have a way to get rid of the dust it will become a serious breathing hazard. The second is you need to use Gorilla Glue or some other polyurethane glue. The glue makes for a awesome bond, but will expand everywhere. So you need to clamp whatever your working on very well.

One other drawback is the price...if you have to buy it it can be expensive, more so the higher density and thickness. But it forgives and holds shape really nice.

@cpt
What sort of detail can it hold? Would it only be the sort of thing to use as a core for a model? For instance a big giant, using it for the inside parts only?

Also, what sorts of tools would you need to shape this?

http://www.allscotltd.co.uk/FOAM/c-1-118/

I presume what you are talking about is the bottom sort, the solid boards.

@Ranthesid
I haven't heard of balsa foam before, I'll have to google that.

Edit:

Balsa foam looks quite good, and versatile.