Jim, Slime is a tire repair product that can be purchased at Pep Boys, etc..., that merely seals the tire from the inside. The tire remains soft and pliable.

The aluminum bars for the top shelf were purchased from a local welding shop. It's standard 1-inch box aluminum. I purchased the heavier duty stuff from the welding ship, but you can buy standard duty stuff from Home depot. You can also buy the detent pins there as well.

What prompted me to design this was I ordered a top shelf from Rock And Roller, and it was bulky, very heavy, difficult to install, and quite expensive. I sent it back and came up with my own design, which is what Scott and many others are now using.

Gary