more or less just adding stuff to current models, not really doing anything major atm. I figured clay wouldnt work very well, so I thought I'd ask what would
Milliput works well as a very cheap substitute and can be bought from most good hobby stores but will not give you the smooth look you'll often be after when adding bits to a model although it's great for rocks and adding stuff to bases.
Otherwise I'd recommend the blue/yellow putty Unforgiven linked to.
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