Very easy to install using the tool provided to remove the valve stem (let air out) then pull out the hose and pour into the hose. Reinstall the valve stem, inflate the tires again, done! This material will seal fairly large holes and stop slow leaks instantly. Better than rubber coatings, better than "other" slime, and maybe even better than overpriced tire "armor" products. I will use it in all bike and lawnmower tires now. Excellent material!