Airseal is enviromentally friendly, simply washes away with water when you take off the tyre. The product provides a permanant puncture repair when exposed to air, so you wont need to get a patch or a plug. As long as you check your tyres regular, and remove any embedded objects, (cos with this stuff in them you might not know they are there) rotate the wheel, hole downwards immediatly and it will re- seal. You will only loose about 1 PSI. Remember though repairing sidewall punctures and tears is a no no, particularly if you use your vehicle on the road as well and this stuff is not designed to fix them either. I have never had a problem with any garage when it comes to worn tyre repacement, I just tell them the type of gunk in them so they don't get a surprise, but the stuff usually all stays coated to the inside of the tyre where it is supposed to be. I have just replaced the Goodyear AT's on my ride and re filled the new tyres with airseal. £10 a corner, I like to think of it as a kind of insurance and it has worked fine for me & the family for many years.