How I make some of my molds by Robert Brown

[rbrown7713]

Here is a slide video, I hope on how I make some of my molds.  

[Jerry B44]

Looks good. I used to use the bubble packing that came over something you bought at the store. Many had a flat bottom. I'd glue the part to that, then pour the mold mix in. Once done, just pull out the mold and the part usually came off the bottom okay. I didn't make as big a parts as your though!

[rbrown7713]

The main reason that I do it this way is because the mold is flexible and by providing a flat surface to sit on, the parts come out the same every time.  The other nice thing is the cover keeps all of the dirt off of the mold, and since I use Pam as my parting agent, it is greasy and it keeps the dust out of the area, plus the flashing is usually very thin, makes the part easy to trim.  There are a 100 ways to make a mold, but this is the way I do mine.