How can I fix a crack in my hottub?

Here's what works for me:

First, drill a VERY small, shallow hole on either end of the crack. Just shallow enough to go through the acryllic and touch the fiberglass, don't go all the way through. This will (hopefully) stop the crack from getting any bigger.

Then apply 2-3 layers of plast-aid on the crack, allowing each application an hour or two to cure before adding the next.
 
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