I have used tyre sealants for years on big motorcycles, if you get a puncture on a bike you are immobilised and immediately vulnerable on a motorway or busy road and if you get a fast deflation at speed it's brown trouser time.
Providing that the maker's instructions as to the quantity to use in a given size and section of tyre are followed to the letter, and the initial drive at low speed after fitting the stuff is carried out, I have found that there are no out of balance problems.
Another benefit of using the stuff is that the very slow pressure loss that all tyres suffer with is much reduced - the tyres stay at pressure longer.
As you may not realise that your tyres have suffered a puncture because the sealant has sealed it, regular inspection is necessary - easy on a bike - much more difficult on a car.
The negative comments from tyre fitters is unjustified as the stuff washes out with water and does not degrade the interior of the tyre.
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