a) Fill it to the brim to simulate you sitting in it whilst it's full. b) Once solvent weld has gone off that's the end of the show mate. You'll be able to tow a car with that, a few knocks won't matter a toss. Adding glue will just create a skin which won't do anything whatsoever and will just peel away once cured.  A bit more to this one. In your left hand you have the 'plughole', and two rubber washers. I usually ditch the upper one and make that up entirely out of sika. The conical on
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