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Silicone sealant does not adhere well to polyethylene or polypropylene bowls. Hot glue (which is mostly melted polyethylene) bonds well to both of those, to glass or metal probes and to PVC-insulated cables. It also hardens almost instantly. I needed to seal a barb fitting to apply vacuum or pressure to a similar container and hot glue was the only product that sealed consistently. There are versions with flexibility optimized for sealing or tensile strength optimized for fastening but the least expensive hot glue has been adequate for both.
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