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I am looking for advice on thermoforming to make a soaking tub from a 55gal HDPE drum Answered

I thought I could make an inexpensive soaking tub by just fitting up an open top 55 gal plastic drum, but my body will not quite fit when I try to sit in it. I just need a couple more inches for my knees. So after viewing a you-tube on how those barrels are made, I have thoughts that I might be able to re-thermo-form the barrel. The more I think about it, if successful, there are lots of uses. Someone posted that HDPE melts around 265F, so I figure that I could get that air temp easily with a hot air gun, possibly inside the barrel, then using a resealable lid, add air pressure to the barrel and surrounded it with a new rigid mold. If I could figure out how to intrude with parts of the rigid mold, I could even make a seat. As I am imagining, the closer I can get it to the shape of my body in a sitting position, the least amount of water I have to use to fill and heat. And then I could add spray foam to the outside for insulation. Does anyone out their have experience blow molding or other recommendations?

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