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So I found this stuff called shape lock http://shapelock.com/page2.html. Its used exactly the same way as instant mold however its extremely hard when cool and dry and turns completely white. If you let it cool just a bit you can use it with instant mold for press castings. I wouldn't really use it for anything more then press casting as its hard to trim with a knife. But at $25 for a 500 gram tub its way cheaper than green stuff. I used it for some bases that I had bought and it worked very well. You could also use it for full casting as it takes detail very well when its very hot. Anyway, it seems to have some good uses and is very cheap. I have a pic of the base but not sure if I should post it. Its not a GW product, maybe a MOD could advise. ok edited with a pic

You absolutely should post. There are plenty of places where only GWS products are allowed, but this is hardly one of them.

Looks interesting.

Looks interesting - says that it is both paintable and reusable.

Being harder than IM it might be better for making moulds for long, thin pieces like swords, decorative plates etc.

I would not use it to make items out of if I were using IM or Shape Lock as the mould though - there is a worry that I would be deforming the mould slightly with each use.

Looks like another name for Polymorph to me.

Apart from the basic concept of becoming malleable when hot, it's completely different from InstantMold and Oyumaru.

I would say much worse for any sort of casting, but much better for shaping your own permanent parts and tools, as it's far more robust.

^ Why would that be 'much worse' for casting?

Problem I see is that since it's paintable does this mean it's not non-stick?

You can't paint IM as it's non-stick, I have gotten nothing to stick to it so far. If putty or anything else sticks to it then it's pretty useless since you would destroy the mold with every single cast you make.

So is this product stick or non-stick?

Because it dries hard. No undercuts.

InstantMold and Oyumaru are about as soft as an eraser when cold, so you can pull stuff out just like from a rubber mold.

I would also say it holds a bit less detail and is harder to 'melt' smoothly.

EDIT: MadCowCrazy, thanks for reminding me. It's also kinda stick. I got my casts out fine by coating the mold with oil before casting.

K I edited my first post and put the pic in there. Sorry for the overexposed original. I decided to paint it since I thought maybe paint wouldn't stick to it. It doesn't and the primer doesn't wipe off or chip when rubbed.

When I pressed it into the instant mold I had let it cool very slightly so as to not melt the instant mold before the cast was complete. I'm quite sure this is what caused the edges to be less sharp the the original as I have also press molded these bases with green stuff using instant mold and they were great. Dam, I should have put a green stuff cast in the pic too. Anyway, it was very easy and for the big 60 mm base I have it saves a lot of expensive green stuff. At $25 for a 500 ml tub you can't really go wrong. I agree with SilverMK2 in that its probably great for swords and such since it is harder; and green stuff is tacky to it, but doesn't stick. it would be better to leave it to cure while in the mold if using green stuff. However Silver said it might damage the mold with each use if using instant mold as the mold itself. While this might be true the beauty of this stuff is you can just heat it up and make the mold again.