.....Radman:....don't mix the grit in it before you spray it on and you won't loose any skin....use a lite color or you will bake in the sun.....you can use aluminum but it is $$$$ and there is a rubber/vinal out that is good for 10 years at least....it is pricey for what you get and MUST BE GLUED DOWN PERFECTLY or it will raise up and "pillow"...patching is easy with a 4" wide tape and some glue....spray on liner is about 88 cents a square foot cost-prep is the hard part[hate that part] and must be perfectly clean and masked off very well with plastic....takes 48 hours to dry and one needs to seal the substrate under it or it will "pillow" also....it is heavy and requires good stringers under it...65 mills or about an 1/8" will outlast the vehicle also one needs to provide for moisture venting or you roof will rot and fall in....specially in winter- in summer you will get mold and rot also.....I have seen trailers with wet ceilings-owner thinking that it is a leaking ceiling but a matter of moisture instead.....saved the poor guy $3k with a $129.00 dehumidifier.....and a drain through the floor.....geofkaye
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