Park Tool

This stuff is really strong. It does work as you'd expect it to.

I have two minor gripes, though. First, it will leave scratches on whatever part you spread it on (e.g., the seat post) everytime you slide the part in and out. The scratched side is typically hidden anyway, so it doesn't usually matter too much, but it's something to be wary of.

Secondly, I wish this compound was available in a smaller-sized tube at a lower price, because I think it'll end up being a lifetime supply for me based on my rare, small uses of it.

If you need some extra leverage this is the product for you. I would think these levers are nearly impossible to snap. Nice handle area, nice build quality, and have a great tip on the end to get under the tire without damaging the tube.

I had the blue handled set already but really wanted this set.? I finally ordered! They are built like tanks, have precision tooling and all of these fit nicely into the hex bolts on the bikes I work on. Took a few uses to get the spinning technique mastered. I love this set, infact I loved them so much I bought the torx spinning set!

When I decided to go tubeless I've never poured sealant directly into the tire, I've always mounted the tire and gone through the valve stem. This method has worked pretty well for me, I can't imagine pouring the sealant into the tire and then trying to complete the mounting to rim with it full of sealant especially with any hard to mount tire. I have a plunger-like product that I've been using but the Park Tool looks like a far better product.