Reddit reviews NoTubes Tire Sealant, 32-Ounce

1. I'd replace that plastic strip with actual tape. I'd recommend gorilla tape. Carefully apply it around the perimeter of the rim then poke a small hole for a valve stem to fit through. Leave room for the tire bead to fit around the inner wall of the rim.
   
   
2. Is your rim drilled for presta or schrader valves? If it's presta then buy a presta valve stem, or if it's drilled for schrader, then buy a schrader valve stem. Your alternative is to do "ghetto tubeless" by cutting the stem out of a tube and using that as a stem instead.
   
   
3. Get a pair of tubeless ready tires. If you are on a budget, I'd recommend these. They've never had a problem seating for me and are very good tires for the money on my 29er. If they have difficulty seating on your rim, try spraying the bead with soapy water. You must use compressed air to seat the bead.
   
   
4. Yes use sealant, I'd recommend Stan's. The bottle provides the amount recommended.

It's THIS

You can use it in Tubless tires, tubular tires and I think also regular tubed tires if you can open up the valve.

I use it in my tubular tires as a preemptive measure. I've also used it in a bottle form for AFTER I've had a flat. You just pour it through the valve (if you have a removable valve head), re-inflate and then go on your way.