One thing I've noticed about silicone is that after a time its adhesion
to some surfaces isn't so good. It's OK for glass tanks but the joints
and seals on the plastic materials (PVC and acrylic) on my outdoor
fish pond weren't as permanent as I'd hoped. Within a few months
the silicone started to peel at the edges, and I could see water starting
to creep in. So I switched to this

http://www.selleys.com.au/Selleys-All-Clear/default.aspx

with much better results. They say it's not meant for water immersion
but I've not noticed any deterioration after nearly 3 years. And the
sealing part of the joint is not in direct water contact. It's solvent
based so I had to wait for it to set fully and then flush the system to
avoid exposing the fish to any nasties. It really sticks and is much
harder than silicone to remove, yet is just as flexible

Joe

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