Cool tutorial. I do some casting myself.

For those that don't have a vacuum chamber, as they can be pricey, especially if you are just doing a little bit of casting, a running dryer can be used to get the bubbles out of your RTV and Resin. The heat from the dryer will also help cure them a little faster. The vibration of the dryer will shake most of the bubbles out of the RTV or Resin mixture.

Works well if you better half is doing laundry, this way she doesn't yell at you for running the dryer for no reason! LOL