Originally Posted by MississippiMan
That didn't tell me much. Describe what you have. Spot sanding, combined with a abrasive 'wipe' can take care of any small uneveness.
Basically speaking, your new to this, so don't discount or count anything as being 'final'.
Give it up. (....info I mean...
OK, maybe my "blemish" was larger than I led you on to believe. It's tough to explain but it was about two quarters sized, and the paint wasn't very consistent in the region. After my botched touch up job, it was clear I needed to spray a few more coats and I'm glad I did.
However, in the process I had a bit of an accident. I had my MDF board leaning against my apartment's patio wall as I sprayed it. I left to get lunch, and found it had fallen flat on to the patio. I suppose the wind got it, and it came crashing on my paint sprayer. It left a nasty gash in the painted screen, but also cracked my sprayer in half! I was able to tape the sprayer in workable shape, and made every effort to fix my new gash. Coat after coat, sanding after sanding, I finally got it to look pretty damn good. It's nearly impossible to tell now with an image projected on it.
Obviously that was a setback, but I've learned some things along the way. I would highly recommend using a very thin mix if you're going to spray. I had to add much more water than was listed in the Silver Fire recipe. The goal is to get a nice fine, misty spray. If it's too thick, it will run, splatter more, and not dry very evenly. A nice, fine spray will require many more coats, but the nice thing is that it can dry in a matter of minutes on a nice sunny day. The end result will be a much smoother screen, with great consistency.
So how do I like the Silver Fire mix? I'm loving it. Compared to a bare wall, it's a big step up. My black-levels are really deep, and the colors are nice and rich. It definitely handles ambient light a lot better. However, people do need to realize that it's not going to do miracles. A dark scene with ambient light will always look muted. There's just no way around it. Does it look better than it would with a bare wall or white screen? Absolutely. Black is just the absence of light, so it will only be as dark as your screen with the ambient light. And in dark scenes, without the contrast of light colored or white objects, black can look pretty lame. With total light control, this pretty much becomes a non-issue. But this is one of the shortcomings that we've come to accept with a PJ. For me, the benefits well offset the negatives.
BTW, I'm using a ceiling-mounted Optoma HD70 (1280x720) PJ throwing a 90" screen at 10 feet away.