I fit around a tyre or two a month or so, on average, using a basic tyre machine (pneumatic bead breaker and wheel clamp, I heave on the tyre bar).
I see a range of substances to ease the process and/or help the bead to seal: tyre mounting paste, tyre mounting wax, or "tyre lube". I'm prepared to spend the time wire brushing and painting rims when they're too corroded, so may not need any very magic properties.
What are the pros and cons of these various gunges? Any particular recommendations?