I haul horse manure and shavings in my dump trailer 2-3 times a month. There is always some in there as I stack it in there day by day, not all at once. In the winter it freezes to the trailer bed and won't slide out. I've notcied that it is finally starting to rust a little, so I would like to find a product that can help it all slide out and protect the bed all at once. My first thought is Fluid Film, but all opinions are welcomed!