Basically the, manufacturer coats the mold with a release chemical. They inject the material into it the mold of a tire, gloves, whatever there making. When it has had enough time to set, they crack the mold open and pull out the tire, or whatever. The chemical that they use helps the tire separate from the mold, ie faster production, so the poor guy/gal doesn't have to fight with the tire to get it out. But it affects some trainers/turbos more then others, causing some tire slippage. Hope that helps.