Just felt like posting this, I use truck bed coating(the aerosol type) sprayed in side my tires. after it dries, it is very hard and very smooth. It seems to help if you run tubes. I tested my tires by running over glass, a shrub of thorns, and small nails. if you do get a puncture the coating swells over it and closes. I use it on cheapo tires, as im not shure of long term effects.. thats all, just letting ya know.