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Yeah you mix up your pot of silicone and vacuum all the bubbles out, you would be surprised how much air is in the mix.
Once it’s all stopped bubbling up and gone flat you take it out and carefully pour in to the mold at a corner, allowing it to fill up and cover the object your making a mold of. There are lots of videos on YouTube
Dogtemple
edmundro
So you vacuum the bubbles out of a litre, or whatever needed, and then pour into your mold?