Just an update for anyone interested in the weight of Rhino coating. I grossly overestimated the weight the product would add; mostly because I overestimated the thickness of the product they would apply. The extra weight (for the entire trailer) added on by the Rhino Lining was only about 25lbs. I had to cut a hole in my roof after it was sprayed, in order to add a vent, and I was able to peel a sample off the chunk of roof I cut out. The stuff is barely 1\32 of an inch, is tough as nails, and weighs nothing.