Originally Posted by lars.egarots
I sprayed on the RS-MaxxMudd (for moderate ambient light), and love it. But, due to the ambient light reflected off my walls, I do wish I could get the blacks just a little darker. It looks good, until I compare the screen to my trim, then it doesn't look as black. Especially the part of the screen that is not masked off when I watch movies in 2.35:1. Would you recommend that I spray on a couple coats of Retro?
Now I for one appreciate your striving to make your Blacks "on screen" look as black as the Screen Trim. That's actually what the Trim is supposed to work toward doing.
But it can't ever quite make it, and in any case, unless your taking the pains to project what is supposed to be a perfect Black, almost any degree of projected Black will have to of a certainty come up looking lighter than a real life Black Velvet reference.
That doesn't mean you cannot approach the Twilight Zone closer than you have already ventured. Blacker Blacks do await using the Retro mix. But be advised that the Gain the Retro manages has some dependency on the reflectivity and/or shade of the underlying Base, and applying many multiple layers of RS-MaxxMudd or Silver Fire paints over another will reduce Gain. Not a bunch, but without the Absorptive/Reflective double punch, you don't have the balance working for you. In the case of simply applying 2-3 layers of Retro, you'd lose the advantage of the white retention-enhancement of the substrate's color, but gain a greater degree of surface reflectivity.
Going the latter route is what will work to combat the sideways directional ambient light. The projected image will be more directional so less light will be traveling sideways to reflect off the side walls. And whatever light does reflect will encounter a darker shade of Gray. The reflected light is considerably less bright and lacks sufficient energy to offset the direct reflected screen output as well as wash out the darker shade of Gray to as great as an extent as to be nearly as distracting.
On a narrow room, with a 140degree radius spread of viewing cone, a lot of light will be striking the side walls. Narrow that spread down to 100 degrees, and the Screen wall, adjacent side walls will suddenly become a lot more 'recessed' away from "Screen generated" luminosty.
So as many a Screen Mfg has tried to do provide to consumers as well,sometimes at a great to unholy expense, combining a dark Gray painted surface with a modest to moderate degree of retro-reflectivity properties is the answer to several niggling concerns. If such a DIY Paint solution achieves such appropriate and controlled retro-reflectivity yet doesn't shimmer with sparkles (...I'm amused how some have taken to describe SF & RS-maxx mixes as doing so...) and therein doesn't require a low PJ mounting solution, and also effectively combats the effect of sensible to OMG levels of ambient light, it could be said it's doing a job few other applications, DIY or Mfg can lay claim to.
But as I say so often, to get the absolute best results in any situation, you need to discover what will make things balance out. Need a dark screen? You need a minimum amount of Lumens at the PJ's Econo level, as well as a some degree of positive
gain at the Screen...so as to avoid depending on excessive light output to mitigate white crush as lower, more Black Friendly levels.
This is what we feel you can have in almost every instance by matching the correct SF-RS-MaxxMudd mix to your PJ & room configuration. The scale of adjustment between the two applications is almost infinite, (...most obviously with SF...) so no one need be limited by a specific set table of choices.
So here's the skinny;
Spray 2-3 coats of Retro over the exiting RS-MaxxMudd and your Blacks will go subterranean on you. You might notice that your viewing cone becomes more restrictive and the gains in reflectivity are muted by the loss of a bright white under-layment if you don't bump up the lamps output to full-w/calibration at that level-. But those Blackest possible Blacks will be yours.
Or...if you first lightly sand the existing RS-Maxx w/medium grit Sanding sponge, (...more to gently prep the surface with some texture than remove material...), roll on two smooth coats of white Primer, lightly sand the second coat, then apply 3 light, even coats of RS-MaxxMudd Retro, you also have significantly deeper Blacks, and less overall attenuation of colors and whites that the "Retro over LL" combo would have left you with.
I'd do the latter myself....UNLESS I didn't intend to worry about the PJ's Bulb output level. If that was the case, I'd just shoot those new coats on and have at it. All you have to see is the difference in shade of Gray the Retro RS mix is and you'll know immediately the end results will be in line with what you feel you need.