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My plan is to use black HDPE plastic sheets (48" x 96") that are 1/4" thick and FDA compliant and food safe. The black color is used to inhibit light which in turn inhibits algae growth. I don't have the welder yet but I'm about to pull the trigger on a Weldy Energy HT1600D (https://www.amazon.com/Digitally-Co...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==). There are cheaper welders out there but his one has digital temperature control, which is important for setting and maintaining consistent welds. I'm also going to get additional nozzles (https://www.amazon.com/dp/B07PQ22P7...olid=18E89URNIKLV0&psc=1&ref_=lv_ov_lig_dp_it) as I'll need the tacking and triangular nozzles for this project. My inspiration for this DIY project comes from Ladi and Margaret (I'd be interested to learn more from you about welding plastic. I have a project in the back of my mind I've been dreaming about along these lines. What material are you planning to source and what thickness? Do you already have the plastic welder? Which one?
I've never welded plastic before, but neither had Ladi and Margaret and it appears all turned out well for them. If the inside water tanks go well, I'll also fabricate some under body waste tanks to fit exactly as needed.