[joshc]

Ok, I have determined that I like a Dead Flat screen. My BW screen has an ever so slight sheen to it, and I am getting a hot spot. Outside of the HS, I love the picture. Actually, it's only noticeable during a bright, solid scene....but still, it's there.
I am sitting close(7ish feet away from a 90-something screen) so, does anyone have any suggestions? I figure I am going to have to get this thing dead flat to get the hotspot to go away. I have some liquitex ultra matting agent I pondered adding, but before I do, I thought I'd get suggestions.
I used PPG grand distinction ceramic flat bermuda beige as the base for this mix. I also have some very nice dead flat target coatings polycarbonate urethane(I swear it doesn't yellow) I thought about applying over this..(I think I know what I'm going to hear about that idea though

Anyway, thoughts?

 

[Harpmaker]

Ok, I have determined that I like a Dead Flat screen. My BW screen has an ever so slight sheen to it, and I am getting a hot spot. Outside of the HS, I love the picture. Actually, it's only noticeable during a bright, solid scene....but still, it's there.
I am sitting close(7ish feet away from a 90-something screen) so, does anyone have any suggestions? I figure I am going to have to get this thing dead flat to get the hotspot to go away. I have some liquitex ultra matting agent I pondered adding, but before I do, I thought I'd get suggestions.
I used PPG grand distinction ceramic flat bermuda beige as the base for this mix. I also have some very nice dead flat target coatings polycarbonate urethane(I swear it doesn't yellow) I thought about applying over this..(I think I know what I'm going to hear about that idea though

Anyway, thoughts?

With such a small screen and close viewing distance I would think that a non-reflectively-enhanced paint would be called for. Since you want a dead flat screen Glidden Premium from Home Depot in Glidden 'Veil' in flat finish would be close to the shade of BW™.

Since it is a thick finish I haven't tried the Liquitex Ultra Matte Gel medium. In my limited testing the Liquitex Matte Medium itself has more sheen than a flat latex paint, but much less gloss than many of the Heavy Body artist paints it is meant to flatten.

All of the water-based polyurethanes we have tested (Minwax, Behr [not sure of the other brands]) have all added yellow to whatever paint they were added to and the yellow has increased with age. That, however, doesn't mean there isn't such a creature out there somewhere. If you want to try spraying your screen with a top coat of Target Coatings EM9300 Exterior clear Polycarbonate Urethane have at it. :T But be advised that Mech's testing showed that a clear top coat pretty much nullified the reflective qualities of BW™; however, since this is what you are after it may be just the ticket for you. As for future yellowing... :dontknow: Another reason why a clear top coat might work for you is I'm getting the feeling you are an experienced sprayer and shooting a clear coat won't be a problem for you.

 

[Pyrometman]

joshc,

If you are thinking about a top coat, perhaps this:

Valspar Clear Protector

They claim it is non-yellowing, and they sell it in a flat finish.

Way back about 6 years ago, I used Behr "Deep Base" but that went yellow. I painted by rolling and it was a little difficult because it is clear. I had to keep the paint wet so I could go over the entire screen with final down strokes.

 

[mechman]

If you are using a flat paint with AAA and getting a hot spot, you will never get rid of the hot spot. Even a flat gray would probably give you a hot spot.

 

[joshc]

Hmm. Food for thought. This hot spot is very mild. I don't think it would be that noticeable, except that this is 1. A reflective screen, and 2. I sit too close(there, I admitted it). Anyway, I definately like the color of the screen over my matte white I was using.

 

[joshc]

It seems, with "proper" sources like a BD, I'm not really noticing the hot spot like when I'm viewing a youtube source. I will probably live with this screen for a while. One follow up question, what causes the errant single "sparkle" occasionally? I'm not talking about the visable "grit" you can see up close, but a lone, super bright particle. I haven't been able to track it down, but I'm wondering if a "fisheye" crater or something could cause it...

 

[Harpmaker]

It seems, with "proper" sources like a BD, I'm not really noticing the hot spot like when I'm viewing a youtube source. I will probably live with this screen for a while. One follow up question, what causes the errant single "sparkle" occasionally? I'm not talking about the visable "grit" you can see up close, but a lone, super bright particle. I haven't been able to track it down, but I'm wondering if a "fisheye" crater or something could cause it...

The only thing that can cause a "flasher" (a single, almost pin point, sparkle is a single flake of aluminum sitting directly on top of the surface of the screen (or I suppose a very small croup of flakes) that is positioned just right to literally act as a mirror and reflect light directly into your eye. If it (or they) really are a bother to you I would try to isolate the flasher's position and then look at that area of the screen with a magnifying glass and see if you can find the offending flake and remove it with the point of a pin or needle. It might also be possible to use a very small and pointy artist paintbrush to apply literally a speck of "matte medium" (lots of brands out there). Be VERY careful about doing the latter, you would only want enough medium to cover the flasher - put on too much, or make the dot too big and the repair would be visible as a repair.

A fisheye crater (a bubble in the wet paint that popped late enough in the drying cycle that the crater formed didn't fill in with paint) would behave in a similar manner, but be much more visible; Mech found that out early in BW™ testing when he tried rolling with a foam roller. When the bubble explodes it leaves a bright ring of aluminum flakes.

As for mild hot spotting, some people don't mind it, some hate it, and others call it added gain. :heehee: