Piston skirt coatings from. Line 2 line are durable like that on modern production pistons. The coatings are also tough enough to allow thicknesses out to .020 (twenty!) over. The coatings are applied thick enough that they reduce piston to wall thickness a lot after run in even. The warm/cool cycles are to get the coating to wear in, absorb oil and take a set so they last. They don't claim any power increase and i suspect that is due to every build being a bit different. Cost me $300 to have them done. Cost goes up as the required thickness goes up.
