Thanks for the offer MississippiMan, but I am not at the point of conducting any test. I am still in the process of fixing up my basement in preperation for a basic home theater setup and for buget reason I am leaning toward a painted surface. I have read many of your post and thank you for all the great advise on DIY screens.
When the time comes I thinking of using the following mixture that you posted a while ago that seems to be low cost and easy to apply and hopefully will provide good results:
1 quart Behr plus ultra UPW interior enamal
1 pint minwax polycrilic water base polyurethane
16 oz delta ceramcoat white pearl finish
8 oz filtered water
8 oz craftsmart silver metallic
BTW, any idea if this mixture will provide any gain? Would like to see at least a 2.0 gain since I will be going for a 145" diag.