Used it to seal Cub Cadet leaking lawn tractor tires. Did as instructed and seemed to work fine. One tire ended up going flat after two weeks. I only filled it back with air and has not leaked since. So other than the first leaking tire, which I'm not sure why that happened, it seems to be working well and holding the tire pressure just fine.

Wow. What an amazing product. I have a piece of land that is covered in these miserable seeds people call goat heads. One pass with my yard tractor and I picked up several. A couple days later I had 2 flat tires and one slow leak in the third. I bought this after seeing many reviews saying to stay away from "the green stuff".

Day 1 - I followed the directions (see tips below) and after inflating the first tire I still heard the leak for about 10-15 seconds then it went silent. Cool, I though, but we'll see if they hold.
Day 2, 3 - Still holding.
Day 4 - Back to the field to mow and haul rocks with my wagon. A couple passes and I spot a nasty goat head embeded deep in my back tire. Nervously I pulled it out ... hiss for about 4 seconds then silence. COOL!
Day 5 - The next day I went over the tractor tires and pulled out all the goat head thorns. It would have been half a dozen leaks, but the tire sealer sealed them.
Day 7 - I'm walking by my wagon, grr 2 flats. The goat heads got my brand new wagon tires. I broke out the Berryman's and pumped some in. Again it worked perfectly. I though, hey my dolly always gets flats, so I pumped some Berryman's in those tires as well.
Day 14 - All 10 tires are still fully inflated

Tips:
1. When you receive the product in the mail, before doing anything, put it in a garbage bag and go outside to unscrew the pump / open the jug. Because of the design of the pump, there will be some of the juice that will spray out and it makes a mess. No problem cleaning up, but it's still messy.

2. When you pump the juice in your tire, make sure the valve stem is at 5 or 7 oclock. You will rotate the tire later, but when you fill you want it to fill near the bottom of the tire.

3. If you have a tube tire, gently hold the valve stem with pliers while you attach the fill hose. Oh yeah, Berryman's works great on tubes as well.

4. MOST IMPORTANT. Put a paper towel around the valve stem when you are taking off the fill hose. There will be a little displaced air in there now, so some juice will squirt out, so having a paper towel rapped around the stem keeps things nice and clean.

5. After putting the juice in your tires, SLOWLY rotate the tires. This keeps the juice on the outside of the tire instead of getting it all over the rims.

Quantities I used in my tires:
Lawn tractor / larger riding lawn mowers
Front tires - 8 pumps
Back tires - 12 pumps
Wagon tires - 6 pumps
Dolley tires - 6 pumps

Item arrived without a flexible tube to connect the bottle to the valve stem. The flexible tube is shown in the instructions on the bottle but it was not included. This made it almost unusable on my lawn mower and wheel barrow. I improvised by using something I had laying around but it made a big mess. I got more sealant on the outside of the wheels and the ground than I got inside the tire.

So far this stuff has proven to be the "Cat's Meow".
I used this for a total of three tires on two riding mowers. All were quite cracked with age, two ten years old and one twenty years old. It's been a month now and they are still holding pressure.
Removed wheels, laid flat, removed stems, pumped in the Seal-r, replaced stem, manipulated each wheel to ensure coating of the sidewalls (some of the cracks were on the sidewalls), filled tires with air then re-manipulated the Seal-r around the sidewalls again, re-installed on tractors. That simple!
I'll update the review in the spring.

I have a large yard with many thorny trees and other spikey stuff in the ground. Over the years I have gotten several flat tires, and I've attempted several solutions (patching the tires, inner tubes, slime sealant, airless tires). Each of of those solutions has been temporary and/or expensive. The problem is that I would inevitably run over more thorns. The airless tires I recently got for the front wheels do seem to have solved the problem. I don't believe anyone makes airless tires for the rears, probably because (1) they would be very expensive and (2) the ride would likely become too bumpy. The slime didn't work as well as this stuff; additionally, that the slime rusts out the wheel from the inside.

I put this stuff in my lawn tractor's current rear leaky tire a couple months ago. I located the puncture, removed the thorn, but did not patch the hole. Pumped this stuff in, added air, and rolled the tire around for a minute before placing it back on the tractor. I have mowed my lawn three times since then. There has not been any air loss in the tire. A friend of mine with a zero-turn-radius mower has had similar air pressure problems, so I let him put some of this stuff in his tires. He reports the same - tires have stayed aired up since then. It has been about a month and I think two mowings for him.