I gave the Instant Mold a whirl a few days ago. I thought I'd start out with a simple one-shot copy. I didn't want to get too fancy to start with, and I'm going to need the practice for starting the Space Wolves.
One of my Wolfen is missing the end of his spear, but lucky for him (and
me) his buddy has a nice spearhead that I could make a copy of. I didn't have any trouble with the Instant Mold, it softened up quite nicely.
I got a decent enough cast with it, although I did use far too much. I will definitely scale back on how much I use next time. I also need to cut it a little straighter next time when I open it up. But this is what practice is for.
Once I separated the mold and filled it, the waiting became somewhat maddening- I really wanted to see how it turned out. So I messed with it a bit and the results were not as good because of it. I'll need to tap into my patience reserves for these tasks in the future.
I got a little wild with the Exacto knife when cutting out the flash and nicked off one of the spear points too far. Despite my carelessness, I think it turned out pretty well once I pinned it in place.
One day, hopefully soon, the heads for these guys will get here. They supposedly shipped eleven days ago from France, so they should find their way into my mail box in the next few days.
Speaking of, you might find the website useful- LudikBazar. That's where I found the heads for these guys. I also snagged a box set of some Wolfen for a reasonable price. They have all sorts of things, including a lot of weird OOP things (like the Wolfen heads I ordered, but also legs, torsos, and even box sets). If you're in the US, the shipping will be murder (10€, about $12.50) and it, apparently, will take ages to get here. But, they had something I never thought I'd be able to find, so I can't complain too much.