True if you have the patience of Job and don't mind your glue job looking like garbage until coralline covers it (many months on a new tank). Also, glue tends to get brittle over time and will more than likely crack at some point.
If your'e working with any of the typical reef type rocks, you'll need a ton of glue to properly hold them together. You'll also make a huge mess and probably glue bits of yourself to your rocks, your fingers, and large quantities of paper towel.
Epoxy is much nicer to work with. There are some epoxies specifically designed to hold rock structures together. A sponsor here used to sell one called Fijicrete but I can't find reference to it on their site anymore so they might have stopped carrying it.
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