Originally Posted by RPS13
I probably didn't explain it well. I was thinking of screws 1" inside from the perimeter, then a velvet trim border being built that just covers the screw heads and is the usual 3-4" wide all around. I'd probably be hanging the border I imagine.
No...I getcha. I hang Sintra in that manner all the time. but I usually have about 2" space between the edge and the Screen area, because when you miter the corners...and then place the trim on top the outside edge and nail it into place, the broader footprint on the Sintra helps keep the Trim from rocking backwards and keeps the Corners flush and even. Even with using 2.25' wide Trim, there would be at minimum 1.25" of non-backed trim hanging over, and it's at the Corners that having support is so critical.
Oh my....what to do???? Simple really. One inch doesn't allow much leeway....but by taking small 4" x 2" strips cut from the piece of 13" x 60" of trimmed Sintra (....be sure to have them save it and give it to you to take with you...)and placing them at the Corners and along the outside edges, you'll provide a spaced support "ledge" for the Trim to lie against. I advise against trying to constrict a free-hanging Trim Frame. It would require effective support and bracing at the Corners, and would have to be "Hung" extremely precisely. That's a lot of hassle. (...been there, tried that...)
First off...you want to use 1.25' "Truss Head Screws" (Sharp Point...not Self Tapping) to hang the sintra to the wall because they have extremely Flat, broad heads. Secondly you want more of them than just one every 32'....more like one every 12' to 15" minimum (trust me on this) even if eventually your adding 1.5" bright Finish Nails through the Trim and underlying Sintra tabs and the 1" boarder area. I've attached a simple diagram below. It was actually based on a Spandex sheet stretched on a Frame and the adding of 1 x 4 x 2" blocks to provide nailers / support for a overlying Frame....but the principle is the same. Just consider the "Frame" as being the Sintra. :
So roughly what sort of gain would an 8% silver S-I-L-V-E-R mix provide? I'm guessing the RS-MM LL would give slightly better contrast given that it's intended purpose is to help improve apparent contrast.
Close in on 2.0 minimum gain. (...it's so effective, even those who know better often state it appears to be 3.0 gain or higher...) BTW, in the dark, S-I-L-V-E-R does provide greatly increased perceived Contrast as well as work to preserve / improve the dynamics of Colors & Whites. But it's lighter shade along with it's gain makes it much more acceptable to washing out under higher levels of ambient light, and it does poorly if subjected to "ANY" directed light. To wit, it's best as serving as a Dedicated Theater Screen.
RS-MaxxMudd was originally intended to replace the MMudd-SE (Silver Edition) formula that used Behr Deep base instead of Polyurethane. It was back then designed to allow a small amount od Silver within a Translucent Mix to provide both a nice boost in Contrast while maintaining a gain higher than 1.0. In fact, the degree of ambient light resistance it provided was a bit surprising. It's not a capable at doing such as Silver Fire, but for a light "Silvery white" surface....it does a pretty effective job as long as any outside lighting influences are in the least kept under reasonable control.
The "LL" version has even higher gain, and is an even lighter "Silvery white' so one can expect it's level of sheer ambient light resistance to drop a bit. But as stated...it still does much better than any non-metallic surface of the same color and hue.
Under given ideal circumstances...S-I-L-V-E-R will outperform RS-MM-LL in the contrast boosting dept. Every time. No exceptions. Introduce ambient light and as such light intensity rises, the advantage lessens and then recedes below RS-MM-LL. Were it not for the need to apply S-I-L-V-E-R in so many multiple, ultra thin Duster coats, you'd see me advocate it for dedicated theaters far more often than i do.
Instead, I find it's best suggested as the "Go To" application where Screen size is "BIG"....lumen availability is lower than recommended for such a size, and ambient lighting is held in check...if not completely in control.