So ive built a Water tank for my camper and gave welding HDPE a go.
I used 7mm triangle filler rod with a plastic welder, there is around 20 meters of welds and i'm having trouble with 3 corners, a few pin hole leaks that i can't seem to fix.
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I've managed to get a weld on the inside for most of the tank and its fully welded on the outside.
Does anyone know of a food safe sealer that i can put in the tank and then i can sikaflex the outside joints for extra strength