Nothing I didn't learn years ago. I was told never to wash my truck as certain car wash soaps can interfere with the ceramic glass coating that was done to it. After 4 years my truck looks showroom new, just waxed. It has protected against rock chips contrary to what this video claims. At 20k miles, you cannot find a paint chip, or any swirls on it. Best thing I ever did. Unfortunately there are many shops that use various coatings, or do a half/ass job saving labor......after-all, the job is mostly ones labor to prep, and properly apply the coating. Imo, it comes down to the shop doing the job. I told the toyota dealer that I bought my truck from, if the ceramic coat lasts 5 years, I'm happy...they told me its guaranteed lifetime. It's saved me a ton of time washing, and waxing the truck like I use to.