I have decided to make my own screen (too poor after buying the projector) After reading this forum, I am going to use Dulux icestorm emulsion. I have a DLP projector and I think Icestorm 5 will be too grey? Should I use a totally smooth surface or one that is slightly rough for the paint to key to properly. Is there a better roller type to use? should I get Matt or Silk emulsion? erm.. Suggestions would be gratefully accepted.