Hi folks-- I finally got some decent comparison shots of the PS90 and both coatings-- taken with a 3.2MP camera, at 2048 x 1536 pixels, auto white balance, and ISO 50. Camera was mounted on a tripod, and I used a time-delay to avoid camera shudder.
I picked a lousy frame ('skrat' was in motion, so he is slightly 'blurred'), but the gain and hotspotting comparisons still apply. First, a shot of the plain uncoated PS90-
Secondly, a shot of a piece of PS90 with a 'fog coat', and 2 finish coats of "Behr Matte Poly" laid over the uncoated PS90-
Thirdly, a shot of a piece of PS90 with a 'fog coat', and 2 finish coats of "UncleScurvy's Mix*" laid over the uncoated PS90-
Fourth, a shot of a the "UncleScurvy's Mix" on top, and "Behr Matte Poly" on the bottom, both laid over the uncoated PS90-
Lastly, a shot of a the "UncleScurvy's Mix" on the left, and "Behr Matte Poly" on the right, both laid over the uncoated PS90-
The long and the short of it (maybe better seen in person than these photos) is that the PS90 hotspots, even with our anemic projector. Both "UncleScurvy's Mix" and the "Behr Matte Poly" kill this hotspotting, and reveal greater detail in white areas of the frame.
One of the attractions of the PS90 was the 'luminous glow, almost like a plasma screen' (yeah, but it hotspots.....) that the material displayed. Both coatings decrease the specular gain of the screen. The plain Behr matte poly seems to reduce the gain more than "UncleScurvy's mix". This is probably a result of the reflective particles in the mixture. As Tiddler's "fusion" experiments demonstrated, the particles in the mix 'glow' when lit from 'behind' by reflected light.
These particles are much tinier than an individual pixel (especially on our 30 year old PJ!), so we see no loss in focus-- in fact the consensus of the guys in the room was that there seemed to be 'more detail' in the UncleScurvy's mix side. (of course, we are NOT the connoisseurs that you guys are-- even after I pointed it out and tried to describe it, many of the guys couldn't 'see' the hotspotting, and liked the untreated screen better.
We plan to spray the whole screen with the Wagner and UncleScurvy's mix next week. Again, thanks to all. I'll be posting more shots as I get them!
*UncleScurvy's Mix recipe was accidental, as I tried to reproduce one of Tiddler's Mixes. It consists of:
1 quart Behr Matte Poly #780
two 2 oz. bottles of FolkArt Metallic White Pearl
1/2 of a 2 oz bottle of Delta Silver Metallic #02608
3 drops of FolkArt Pure Metallic Gold