How waterproof is epoxy/silica and epoxy/bubbles?

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mariobrothers88

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Hi guys, how waterproof is epoxy/silica and epoxy/glass bubbles? Can you count on them to be completely waterproof or are they a bit porous and you should expect that some moisture can pass through?

Thanks for all your help guys i really appreciate it!
 
If the powders are well dispersed them it should be waterproof.

Undisolved clumps of powder are not waterproof.

A very thin layer may not be as waterproof as neat epoxy
 
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