in the middle should be plugable take it down a tyre fitter and they can have a lookdont even think about using slime you will be hated forever by the tyre fitter
-- fitter wont fix once used it (the slime that is)there is the point, why when obviously at home would you put £10 shit in your tyre when 10 mins spanner spinning has a wheel you can take down and have fixed correctly, and not cost another £xxx for a new one(pretty sure having all that extra weight in your tyre would cause some issues aswell)(slime is a great emergancy repair if i was down my uncles 300miles away on a sunday and needed to get home but had a flat from a nail i would use it but if im anywhere in cumbria i wouldnt, i would find another way)
I read somewhere a long time ago about some tyre fitters not liking the use of tyre sealant so I asked at my local Yamaha dealership (now the oldest dealership in the country)their opinion on it was,we sell the stuff to the customer to use & tyre fitters that moan about it are just being lazy not wanting to clean the wheel & tyre inside before repair. As darrsi said as long as the correct qty is put in the tyre to coat the inner surface no imbalance will occur, in the States & other parts of the world they use balance beads instead of weights with no ill effect.
Yes, the type you add through the tyre valve like the sealant but just for balancing purposes.