I would like to know which type of polycarbonate is not easy to get stain,Plane type or embossed type? Do you think De Skylight good for instal the polycarbonate works? Did your know Vintechnic Skylight Sdn Bhd? he quote me Marklon Sunstop series RM28sqf with Frame 2"x4" for Car Porch. Is it the price expensive?