I put over 100K miles on bikes with Slime'd tubes and I had great results. They rarely made a mess because I knew how to air up a tire.
10 and 2. Valve stem should be between 10 and 2. Otherwise you're doing it wrong. I also used quality tubes and Slime'd em myself.
12oz bottle, 5oz in front, 7oz in back. If you do get the stuff on something, well, it's liquid latex. Water dilutes it and washes it away.
If only my tires were a little less wide, i could get solid tires. Alas, none available for 26 x 2.125
Bad idea. Solid tires on anything but very low speed bikes is an accident waiting to happen. The tire will not be stable during cornering.
The bike will ride like crap and it will vibrate a lot more. The welds on the bike frame will likely fail much earlier they would otherwise.
Boy ain't that the truth.
I'm experimenting with putting a pneumatic tube underneath an airless to create a run flat, but I haven't had promising results.
And you probably never will. Airless tires on anything with 2 wheels and a motor is pretty much a charlie foxtrot of a failmission.
Don't believe me? Go bend some corners on a loaded MaB with airless/solid. Make sure you wear safety gear.
Or don't and hopefully win a Darwin Award.