White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 16 Old 12-12-12, 12:03 PM
Nak
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

Here's a shot of a screen that does not hotspot, taken with a flash:



Yeah, in most scenes you won't be able to visually identify the hotspot. That doesn't mean it's not affecting your PQ. Switching from a screen that had a hotspot to one that didn't recently, I can tell you the improvement in PQ was VAST. I thought I had a great picture before, the difference with the new screen was at least as great as switching from SD to HD.

I'm not making blanket statements about any particular paint formulae, I don't have the experience to do that. But the screen in your last pic is hotspotting rather badly. No offense intended, just trying to help out.

Last edited by Nak; 12-12-12 at 12:11 PM.
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post #12 of 16 Old 12-12-12, 12:20 PM Thread Starter
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

Oh, sure, I certainly don't deny it in that shot. I'm not sure I can compare it to yours, though, because of camera, distance, flash strength, and all kinds of other factors.

Here's a 100% white screen on RS-MM-LL and plain BOC. Unfortunately the exposures were different so it's not pure apples-to-apples, but you can see my PJ is not all that uniform in the first place, and the lighter areas are in the same positions on both screens:



With a 100% white up, when I walk around the RS, I don't see any hotspots, assuming I am correct in thinking a hotspot should appear to move with me as I walk around?

I'm not saying I'm a fan of hotspots, just that I don't see any in regular viewing or even with a 100% white pattern. It's not like I've never seen an image with no hotspot; I'm coming from BOC that I used for 5 years after all.

In any case, I didn't recommend RS-MM-LL :P My conclusion was basically that it's comparable but not superior to SW (assuming the hotspot I *do* see with SW is somehow user error, since I don't think anyone else has reported issues), while being more expensive and more of a pain to mix. I can't think of a reason to use it over an OTS.
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post #13 of 16 Old 12-14-12, 12:22 PM Thread Starter
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

As I mentioned on another thread, I have pretty serious hotspotting on my SW panel (I have since rolled on a couple coats to see how it compares to spraying, and the hotspotting is not improved), so I can't recommend that anymore.

As far as I know, no one else has ever mentioned hotspotting with SW so I don't know what my problem is.
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post #14 of 16 Old 12-14-12, 05:40 PM
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

Quote:
curttard wrote: View Post
As I mentioned on another thread, I have pretty serious hotspotting on my SW panel (I have since rolled on a couple coats to see how it compares to spraying, and the hotspotting is not improved), so I can't recommend that anymore.

As far as I know, no one else has ever mentioned hotspotting with SW so I don't know what my problem is.
If you could send me a sample of your SW paint to test with my glossometer it might answer what's going on here. If you would like to do that just PM me for my address. The sample should be about 1 inch wide and 5 inches long.

If I were you I would take that can of paint back to your SW store (so they can get the lot number off it) and explain your problem to them. My guess is that they would give you a replacement can of paint from a different lot for free. I have tried 'Extra White' bases in both SW ProClassic series B20 and SW Color To Go (the paint used to make their samples) in satin base and neither hot spotted for me.
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post #15 of 16 Old 12-15-12, 12:35 AM Thread Starter
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

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Harpmaker wrote: View Post
If you could send me a sample of your SW paint to test with my glossometer it might answer what's going on here. If you would like to do that just PM me for my address. The sample should be about 1 inch wide and 5 inches long.

If I were you I would take that can of paint back to your SW store (so they can get the lot number off it) and explain your problem to them. My guess is that they would give you a replacement can of paint from a different lot for free. I have tried 'Extra White' bases in both SW ProClassic series B20 and SW Color To Go (the paint used to make their samples) in satin base and neither hot spotted for me.
Sure, I think I actually still have your address. What should the sample be? I.e. what material.

Thanks!
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post #16 of 16 Old 12-15-12, 12:18 PM
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Re: White screen: BOC vs RS-MM-LL vs C&S Ultra vs Sherwin-Williams

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curttard wrote: View Post
Sure, I think I actually still have your address. What should the sample be? I.e. what material.

Thanks!
The substrate painted can be just about anything with a smooth surface. A piece of chip board, cardboard, 110lb cover paper etc.

The best sample would be something that was painted at the same time the screen was, but the next best is to apply paint to the sample substrate using an artist's palette knife or even just a butter knife or Popsicle stick. The idea is to spread the paint in an even coat on the substrate.

After the sample has dried and cured a bit (at least 24 hours) simply fold a piece of white paper towel around it (no printed designs on the paper towel!) then pop it in a regular envelope. The paper towel will help preserve the sample as it makes it's way through the mail system.
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