Working with Weld-On 16 ?

[DiverDude]

Actually, that's the plan. I'm making a box; there will be a cutout at one end which will be the spillway back into the tank and the whole box will hang on a piece that I will heat-bend into a U shape and then bond to the box part.

That will be plenty strong. In fact, I'm pretty sure that weld-on 3 will be fine for the box as well but I 'discovered' this thicker, and supposedly stronger weld-on 16 and bought a tube to try and thought it would be good for the box -until I found it was a gel and not a water-like substance.