It's not hard to work with but I have an allergic reaction to it. It's a chemical reaction and the fumes make my eyes swell and my hands break out in an itchy rash. I have heard it called other things but I just have a sensitivity to it I guess. So I use a barrier cream or gloves when I work with it.
Otherwise it's awesome stuff! Once it cures it is hard as a rock. I have cut into it/drilled holes into it/dropped it on the floor. It's very hard and not very porous so it takes paint well also. Easy to smooth and work with. If you just need a small amount I can send you a glob if you don't mind paying for shipping.
I think I read PoniesYeah had the same issues of working with it. And, if memory serves, the reaction that people have to the stuff is to the chemical in ONE of the parts.. When you mix them together, a chemical reaction occurs that neutralizes it. So for her, she just tried mixing it up with gloves on, let it sit for half an hour, then worked with it and had no more problems.
It could be worth looking into anyway
You could send her a PM about it and see if my memory was right.