DIY reef safe decor

I'm curious about the answer to the original question either way. Even if it turns out this peeve can be put in the tank with no sealant, what should be used if it needs it?
 
There are various brush-on sealants that can be used. I've done some articles coral making in my day and I used all kinds of sealants, foams, release agents, pigments, etc, etc, etc.
 

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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

  • A fish’s behavior or appetite changes

    Votes: 13 16.3%
  • A coral looks different or stops opening normally

    Votes: 49 61.3%
  • Water clarity or surface appearance changes

    Votes: 12 15.0%
  • Equipment sounds or flow seem different

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  • A test result catches my attention

    Votes: 17 21.3%
  • Algae or other growth starts changing

    Votes: 16 20.0%
  • I usually notice when the problem is already obvious

    Votes: 4 5.0%
  • It depends on what’s going on

    Votes: 16 20.0%
  • Other (Post in the comments)

    Votes: 1 1.3%
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