Ah, epoxy putty, solvent... magic words!Well I am the cook here, and I just made way too much pizza. My wife hates to shop and cook, so she gets to clean the house, do the dishes, and take care of the dogs.
So I can honestly say that I’ve never had a reason to complain about my wife’s cooking.
As for the PVC tank, I think any polyester body filler will work OK, but I would have a tendency to use epoxy putty, if you can do the molding with the small amount. It is considerably more expensive but it’s also stronger and faster.
Otherwise I would suggest that you take PVC shavings and melt them in solvent, and apply them as a filler putty.
You can then shape the ends with a hot piece of iron after they harden, before you do the shaving and sanding.
What you can buy here is generally what people are familiar with using, and I often struggle to ask for stuff as I need to do it using words I don't always know. I remember when spanners were incredibly difficult to buy, which sounds mad now. At the moment I want a rectangular cover for the rectangular access hole in the top of our sewer - it is only 10-15 years old but finding one is like nearly impossible.