Has anyone put any tyre sealant in their tyres?
What type and how much in each tyre?
I would not bother if I were you as when you come to change worn tyres, you will probably find that most tyre depots will not change tyres that have had sealant in them as it ruins their machines. OK if you change your tyres yourself but is it really worthwhile? It was the thing to do about 20 years ago but not popular nowadays.