Planted Tank Enthusiast
Join Date: Apr 2009
Location: Alberta, Canada
Silicone does not bond well to most plastics. Specific formulations are substantially better than others, but I'm not aware of any long term tests.
If you are using PVC fittings, use PVC cement. There are several designs that use only PVC (or switch to threaded connections for other plastics).
Mixing plastics makes things more challenging but epoxy or jbweld (preferably variations designed for plastic) are often recommended.
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