Woohoo, I'm done! I looked sideways on the screen and there were still some vague sprayed high/low lustre tracks so I was worried about that when putting first light on to it. Also, the screen picked up some dust blobs here and there so I carefully plucked those off.
Handling the screen by myself was a tall order. I had to maneuver it out from behind and around a furnace through a door. Halfway through the door, I noticed I caught a protuding handle on the furnace and it was poking a dent in the canvas--aaaeeeeiiii
. I recovered from that and the "dent" faded out and back to a flat surface--yay! I then struggled to move it through the rec room and lift it unto a box over the old screen. (I had done this twice already with pre-finish coats, but this time I had to be super careful). Now, startup my Mits HC3800, zoom to an image to fill the screen and focus. I had tears in my eyes. The image was pristine. Very even across the screen, no hot or cold spots. Colors are fantastic along with contrast and enough light in low mode. I watched several hours of TV and a DVD movie, then went to bed--happy!!
Here's a summary of what took place to get here.
1. Put together 128"x72" aluminum square tube frame.
2. Stretch BOC over it.
3. Rolled two coats of Behr 1850 UPW flat enamel on the BOC.
4. Test image on screen so far--wow, very nice even with just the Behr.
5. Mixed a batch of RS-MM-LL, let sit overnight.
6. Rolled on two coats of RS-MM-LL over the Behr. Let first coat dry over night.
6. Checked the image on projector. Could see some hot/cold tracks due to rolling. Screen had a lot of particle grain to it. Definitely higher gain than one. I compared to a 1.0 gain material and the 2+ gain screen already in place, and I would say the screen was 1.4+. Overall, the screen had a slight sheen to it though, but the image seemed muddy to me (not sure how else to describe it) --hmm,
I was worried from this point on.
7. Several days later, whipped up another batch of RS-MM-LL and let sit overnight.
8. Next morning, sprayed on several light duster coats followed by several slow overlapping coats. Getting used to sprayer. Paint seems too thick. Lots of alternating wet/dry tracks on the screen. Worry again. Cleaned spray nozzle and accidentally got water inside spray blower--ugh!!
Cleaned that out, thinned paint and went back to spraying final coats. Gave it several even overlapping coats at 10" with the thinner paint mixture and that did the trick. Then did several duster passes per Mississippi's directions.
Just a pre-conclusion note: I have had projectors since 1995 (yes, I started with CRTs, a Benq 8700, an Optoma HD70, an Optoma HD20--for several days, and now a Mits 3800). I also have had various screens, including 1.0 gain Stewart, 1.5 gain Dalite Silver Matte, 2.5 gain Dalite High Power, and 2+ gain Draper M2500. Does this replace all those screens without trepidation--yes--except for the Dalite High Power--not much beats that--but it's not a good screen for ceiling mounted projectors--and I couldn't afford it anyway.
My conclusions--screen pics to follow later today if possible:
* Rolled Behr UPW Flat enamel over BOC is pretty good and many would like it as is. Could not see roller marks.
* Rolled RS-MM-LL gives a different image impression than sprayed. I did not like it rolled.
* Rolled RS-MM-LL appears to have slightly more gain than sprayed. I would say the final sprayed image has about 1.2 gain vs. 1.4 of the rolled, but overall much better image quality (yeah, you guys keep telling us that, but I had to prove for myself
). It could be the final duster coats that reduce sheen causes the gain to go down.
* With RS-MM-LL a large screen (145"--my final bordered image) can handle a projector in low mode (Mits is supposed to be between 500-600 lumens in low mode).
* I see no color tweaking required. There is no individual color push that I could see-whites are white. Maybe needs some contrast/brightness tweaking, but that's it. Blacks are very nice, but they were also nice on my 126" Draper M2500 2+ gain, which this will be replacing.* Sprayed screen is very 3D. Rolled version, not so much.
I think many DIYers would like hearing that conclusion as the question seems to come up frequently on this board.
Here are the pics I promised. All shot with a Lumix ZS3. I don't have any velvet board around the edge of the screen yet, so you can see what ambient light does to the blank edges. Also, colors are much better than the camera shows and it also introduced some image noise--take that into consideration.
This is a shot of the first coat of Behr 1850 UPW Flat Enamel on the BOC --not bad!
First image on new RS-MaxxMudd-LL screen. Room is completely dark.
Okay, I open the two windows in back to get some ambient light--room is over 50 feet long so take that into consideration.
Here's the same shot with window light from behind--hey very watchable.
Closed windows with dark shades. Room is cave-like. Note, the snow looks blue and that is correct due to bright sun and blue sky reflection.
I turned on all the overhead fluorescent lights. Washed out, but still watchable.
Here's same shot straight on with all lights on.
Now completely dark again.
Same shot at 45 degree off center--still pretty bright.
Here's a telltale shot of an almost white screen. Note the swatch of 1.0 gain material hanging from a piece of duct tape. It looks slightly darker. Screen is about 1.2 gain, I'm guessing. Note the slight hot spot in the general center of the screen. I do not see this, but the camera does.
Here's same image shot at 45 degrees. Note swatch now brighter. Typical of a gain screen. Off axis loss of gain. The image looks slightly blue, but that's the camera. I did not see that. The moire pattern on the left side of the screen is due to the screen door of the dlp and my camera's reaction to it--I do not see that on screen.
Here's what Mits HC3800 owners want to see. This pic is in low lamp mode (between 500-600 lumens) and really looks like a saw it.
Same image with HC3800 in standard lamp mode (700-800 lumens I think). Note the kick in brightness, but not really needed. Made my day.