After using a wheel barrow in a bramble filled field developed a puncture we were at the point of discarding it but despite being naturally skeptical of manufacturers claims, we ordered a bottle from Tyre Rite.
Following the instructions, which basically was, remove tyre valve core with included remover, inject 200ml into the tyre, clean valve with air line, then re-inflate tyre... and that's it.
Last time this barrow had a puncture it took months to get a replacement tyre and a lot of effort and more time to fit it, we eventually had to get the tubeless tyre fitted at a specialist car type fitting outlet, and it took them 20 mins to wedge it on.
We even managed to fix a really old barrow that was found in a paddock which had not been used for many years.
It's really good value for money too as one 1l bottle will fix 5 wheel barrow tyres
As someone who had to carry a foot pump around while poo-picking the fields this product has been invaluable.
Update:
The first barrow repaired with OKO 'Off-Road' Puncture Protection sprung a leak, typically just after the second barrow had been repaired, but simply repeating the process outline above and pumping the tyre up again has done the trick!