Silicone isn't supposed to be very strong for acrylic to glass bond, but for making baffles it is perfectly adaquate (no big water pressur differential) ... & no huge problem if the bond breaks in a few years, you just have to redo the seam.
On a related topic <may be a bit of a hi jacking of this thread ... sorry> I know that weld-on is the stuff to use for acrylic to acrylic, but I am having problem finding that in Edmonton ... Do you E/E (or anyone) know of a soure? I've check Home Depot, etc & phoned some of the the plastics places in the yellow pages ... so far no luck.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.