My sump has had a pinhole leak for a couple of months, and because I am lazy, and it seemed like a huge thing to fix, I let it go. Thursday night, as I fed the tank, my arm brushed up against the towels on the shelf, and they were soaked. The leak was no longer pinhole, but not gushing either. Took a couple of towel changes through the night, but was able to make it to 9am opening of Petco to buy a 40 breeder to use as an emergency sump. (fun side note: I have a 20 long I probably could have used, but that didn't occur to me until today)
My plan is to clean out the acrylic sump and refugium, do a test to see if I can find the leak, and then apply WeldOn 4 liberally to all seams.
Is that a good plan long term? I'm thinking not really, because I did that when I got it, and it failed (3yrs though).
Short of "buy a new sump, dummy", what suggestions might you offer to repair it?