The Goo screen paint is effective and a bargain for the performance. I spoke with the company and they elaborated on the installation. Go to the site and activate the 1 MB video installation. they explain the paint technique. they are based in Kingston, Ontario but ship via Montreal. It is a high grade acrylic over a base coat (white or gray) which acts much like a mirror backing of glass (to make a mirror). You do need to expend some labour and screen material - a smooth flat stiff surface is best. You get a screen equal to one costing 5 times the price for your materials and efforts. That is why it is highly recommended. the key is good paint technique with 1/4" pile roller with the right gental technique. I have looked closely at the NEC WT610 to get a large image. I am already set up to receive a ceiling mount front projector at 3.4 metre from the wall (screen). The NEC WT610 is limited to 100 diagonal. Are there front projectors that can equal 100 inch diagonal or better at the 3.4 metre distance. I am seeking alternatives to the NEC WT610 that would be better value for the dollar.