YES. I did my cargo trailer over the summer with BlackJack Ultra Roof 1000
(Paid $25 /gal at Lowe's)
Link to their YouTube vid:
http://www.youtube.com/watch?v=JJTbAK-grrw
It made a Very Big Difference and I live in south west Florida.
With alum/steel 6 x 12 ft Vnose trailer closed up and parked out in the field, by 2pm the interior temp avgd 8 degrees cooler inside than outside.
And that's before I did any insulation.
I picked the BlackJack Ultra Roof 1000 coating over all the others (including Kool Seal) because it reflects heat the best, flexes the most and needs no priming, acid washing, etc of the surface. Just wash roof prior to application with soap/water, rinse well and let dry completely.
Easily applied with a 3/4 nap roller right onto the metal roof. Easily cleans up with soap and water if you clean drips & hands immediately. Follow easy directions.
The BlackJack made it bearable enough to be out there in the August sun, insulating with Rmax 3/4" Polyisocyanurate Insulated Sheathing behind the 1/4" plywood walls and on the ceiling.
(Ceiling I also added Reflextix between the Rmax and the 1/4" plywood.)
I'm very glad I found that stuff.
