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Yeh it's not a good idea. Most silicones will suffer inhibition when cured in contact with another type of silicone (ie. addition poured over condensation, and vise versa), so chances are it won't actually cure.
Then even on the off chance you dont experience inhibition, the different shrink rate between the two materials will mean they wont bond to each other and your mould will fall apart after a little while.
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