The Stoner Rocket Release is almost as good in my experience, but smells terrible.
I guess you could use *really* small amount of vasoline, but using the talc until you can get a spray release will be fine.
BTW, to try and gauge how much silicone you need to fill a mould, use clean dry sand, sugar or salt to fill the mould to the desired level with the object to be cast, pour the sand, sugar or salt out into your mixing cup, mark the side of the cup, and then using that mark on the cup fill to that level with silicone. Clean the mould of any loose sand, salt or sugar. Mix catalyst with silicone as usual and pour into cleaned mould.
Hell, you could even use rice or small beans to do this.