We looked at many products before making our decision and we though yours was the most expensive, as it turned out it was the cheapest. Donna walked us through the whole deal. What the contractor originally wanted to do was going to require us to set a primer down first then the tar roof and gravel. We saved over $3500.00 just in the labor alone. Wish we know about your product two years ago when we built our warehouse. Thanks for returning our calls, it’s like pulling teeth to get a return call from some of the other companies out there!