My Play-doh has gone bad and needs to be replaced. I used this same 50+ pounds of play-dough (store bought) for around 10 years kept in a 5 gallon bucket. It didn't dry, but it did suddenly get moldy. I'm planning on making the next batch of play-doh myself and perhaps 20 pounds this time since I will only be testing handguns from now on. While looking up various recipes, I found something called non-Newtonian fluids (specifically a rheopectic non-Newtonian fluid). I remember playing with similar stuff as a kid called crazy slime or something along those lines. It was kept in a ziplock bag and had the consistancy of a very thick ketchup when held, but if hit, it felt like a solid. I wondered even back then how it would react if shot with something of high velocity. Would it act upon the bullet as a solid and shatter, or would it behave like something closer to play-doh? Though I plan on sticking with play-doh since it behaves similar to 10% ballistic gelatin and provides picture perfect expansion of both SP and JHP bullets, I would like to see if how a JHP would react to this stuff. I must know if it will expand as designed against a liquid or flatten as if hitting a solid. Before trying, has anyone done this before? I understand Silly Putty is also a non-Newtonian fluid and will shatter if shot with a bullet. Has anyone seen this happen?