While it's nice to have a clean, new looking trailer, I would be concerned about coating a trailer with some of the products on the market today. While I have no scientific evidence on this stuff, it occurred to me that if the product is flexible and doesn't crack, you'd never be able to detect a stress crack until it was too late. I regularly check the trailer for bolt tightness, cracks etc...and it would probably worry me more than anything else if I couldn't see the actual condition of the metal. What do you think?