Does anybody have personal experience with this product? Wanting to put it on my lowboy trailer, I haul a lot of steel wheeled equipment. My lowboy sets outside year round, as of now. I have conflicting reviews locally. Some say it will expand and contract 3" in length!! Some say NO!! I need more input before pulling the trigger. My 2" oak lasted 20 years outside. I was faithful about sealing it for about 5 years, then I dropped the ball. Looking for something like this product.