My rather late 2 cents into this conversation: Alteco Epo Putty (A + B). It comes in a small package of tubes (A + B) and a larger cubic portion of (A + B). Very soft and easy to mould and handle. It also doesn't really stink or give off a strong "epoxy odour".
It can be found at some local hardware stores. It has been used extensively in a lot of documented reef builds on various forums with no adverse effects (aside from the typical extra foaming of skimmers).
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