One of my mates is a professional gardener and his 'boss' bought a new mini ride on tractor and from day one it was getting punctures (thorns).
I suggested he 'fit' Ultraseal [1] in all the tyres, they did and they haven't had a puncture since ;-)
All the best ..
T i m
[T] Ultraseal is a very special formula 'gloop' that you put inside each tyre (and it forms a permenant seal (no other repair required) in most cases (where it would be safe to do so) when you get a puncture).It is NOT the same as the stuff you get for cycles nor the 'get you home' solution like Tyre Weld or Finlek (sp?). It is also 'tyre fitter friendy' as it's water soluable ;-)
It is supposed to be 'fitted' as a preventative measure (fit new tyres on yer car / motorbike / caravan, fit Ultraseal at the same time sorta thing) but I have used it retrospectivly 3 times now with good effect ;-)
No connection just a happy user etc etc ..