Mouldable lightweight clay-like substance

Can anyone recommend any alternatives to clay? Clay is way too heavy. Preferably should dry by air instead of firing or anything complex, and can be easily moulded or sanded into shape. Price should also be reasonable too, because I will be using a large amount.

Thanks guys and gals :D

foam + a skin of bondo? or would you be doing small details?

Milliput is great, it comes as an epoxy, you mix the two parts and then mold it, its not for huge areas, but when it dries its like rock, you can sand, drill cut it etc. Its great stuff. i used it on my HAlf life 2 case mod.

http://search.ebay.co.uk/milliput_W0...dsreturnedZ300

Maybe you could make a mold and then fill it with expanding foam or something.

Expanding foam.

You could always do.... Papier-mâché! :D

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Originally Posted by SgtM

Expanding foam.

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That stuff dissolves when certain paints are applied.

Thanks for your replies, I think I'll use papier-mâché, because it's the cheapest while still being practical for my purposes. Plus I can get my hands on it quicker and get to work on my mod soon.
+reps all around if I haven't done it already.

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Originally Posted by SnowFire

You could always do.... Papier-mâché! :D

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Originally Posted by Crazy Buddhist

How about buying one of these £1 and making a fibreglass or papier mache housing around it as a mold. ... Papier Mache used to be used for furniture - it would be plenty strong

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Great minds think alike? Or fools seldom differ? :D :D: :D