I decided my MUNNY was a bit too expensive for my first attempt at DIY vinyl toys. I looked around and found these:
http://www.colorblanks.com/toys/
Color blanks. DIY viny toys, but at very cheap price. I also found another DIY vinyl toys by brand Doodle Buds. I bought a bunch of the color blanks and doodle budz at various sizes. All combined they cost about as much as my one Munny!
I wanted to experiment, see if I could bake sculpy on these guys without melting them. I found some instructions at instructables.com that mentioned you could cure the sculpy at 200, so I tried that. The sculpy didn't quite set at 200, so I turned up the oven to 225. This is only 50 degrees cooler than what sculpy should set at. However, the vinyl toy was VERY wobbly, on the verge of melting. But it was successful! I was able to add some sculpy pieces. I decided to set the detail sculpy with my hot air gun. This combination gave pretty good results.
I really wanted to take a picture of the before subject and take some pictures as it came together. I painted up my test subject and put the finishing touches before I could take pictures. It came together THAT quickly. I created a small top hat and scythe for it. I took pictures before I put the final clear coat, but you get the idea.
So what have I found? You CAN use sculpy on vinyl, but you have to be really careful.