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Message: <blockquote data-quote="Diehonda" data-source="post: 892387" data-attributes="member: 561062">Mastic will crack under the vibration of a box.  People use it in FL because it is inexpensive and allows you to replace it.  It also sets up a little better in that salty climate.  All you have to do is wet the mastic and scrape it up and it comes up clean to the substrate, ready for the next project.  Mortar is for permanent installations which would be best for a box encolsure.  The acrylic fortifier is most important as it will allow for minor expansion without cracking.You can also get glow in the dark grout if you really wanted to give it a custom look.  With translucent glass tile.  May look good.</blockquote>

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