Mitsubishi is a project that we have been working on for 2  years since 2008.  We have done waterproofing work for a number of roofs including steel metal sheet roofing and concrete roofing.   For the metal sheet roofing we used a special silicon from Japan and our own brand insulation paint.  For the concrete roofing we used an acrylic roof  coating that keeps out all the rain.  Again as a top coat on some areas we used insulation paint.