Don't use this, this product is like Flexseal rubberized sealer.
This is a reef safe insta set spray:
Insta-set Super Glue Accelerator
Insta-set accelerator will help speed up the set time of any cyanoacrylate super glue. The most frustrating thing about fragging coral is the time you need to wait for the glue to set, or the frag may simply just fall over and get glue all over. With the accelerator that time spent waiting will...
If your rock scape is glued up now, and has been allowed to cure, I don't believe you'd need the insta set spray at this point.
I would reinforce your 'scape using super glue and something like Poly-Fil, Cig butts, paper towel, baking soda, etc. You can also use a little sand or rock dust to hide those joints.
You can also use a variety of reef safe epoxies to reinforce your joints:
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