I had problems with the tires of my scooter. They continuously lose air. After applying ELASTOFIT they are totally sealed and has been for over 9 months and 11,000 kilometers. The application is easy with the "ELASTOFIT tire repair kit Starter". The durability of the sealant is also very positive. A small drawback: It is clear from the instructions not apparent how much of the sealant is required per tire.
--- A really good product, what you can with a clear conscience. ---
ADDITIONAL:
After 18 months, I have had now change tires. The sealant has attacked, according to the workshop, the metal rim. A tight fit of the new tires was no longer possible. I had to buy new wheels.