Add a lid to an iron box and ask it to be sealed? That's it... Craftsman Jiangu looked at Rhett hard and said, "This is not difficult, isn't it just sealing the edge! iron on it. Leave another circle beyond the outer edge of the mouth of the can, then wrap it and press it inward, first give one radian so that the outer layer covers the inner layer, then press tightly to stick to the outer wall of the can, so there will be no gaps.