I have a flat dolly tire. It’s an off-brand, not a Seitech. APS sold me perfectly sized ‘old wheelbarrow tire’ and matching tube, actually two since I immediately punctured a hole in one trying get it and the tire back on the plastic hub. I’m in my local Home Depot the next day, to pick up a few things including ‘Great Stuff’ expanding foam. I happen past the selection of wheelbarrow wheels. There it is--a flat free tire filled with something that must be similar. So I’m thinking…anyone ever tried filling a tire with expanding foam?