how to smooth rough silicone RPF Costume and Prop Maker Community

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

MK85 Iron Man Cosplay w/ Infinity Stones - 100% 3D Printed (Pic and resource heavy)

Varok Saurfang (My hubris finally got the better of me)

My silicone mask project RPF Costume and Prop Maker Community

Atropos - silicone prosthetic makeup

My first Mandalorian Helmet - Work in Progress

Comic-inspired Magneto Helmet Build RPF Costume and Prop Maker Community

Need help/suggestions how to make an ice block

Silicone mask core guidance RPF Costume and Prop Maker Community

Evil Ash from Army of Darkness silicone mask and full costume WIP

Buck Rogers The Plot to Kill a City Blaster Build