I am trying my hand at this silicone baby stuff for the first time ever. Its going ok except I am learning on my own and mostly guessing. I have completed my molds and made the body parts and some of them are rough and some have airbubbles. To fix the rough parts, I have seen people use sandpaper so I got the 1200 grit wet dry but its not smoothing at all. It leaves lines in it, someone please let me know how to smooth silicone out with something I have around the house!