Originally posted by KenLim
I'm about to take the plunge and get some Polywall 4X8 at my local Home Depot.
I've already checked it out....problem is that every piece I checked had many small dimples 3-7 mm across and probably 1 mm deep on the back side. from re-reading all the posts it looks like people have used both the front [slightly textured, shinier] and back [matte, smooth] sides of this material. Which side works better? If the back/matte side is preferred, do U all have dimples in it? do they distract from the PQ/viewing? Should I try to find a smoother piece?
Okay, I thought that perhaps I had failed to notice any dimples/depressions on my sheet of Poly-Wall, so I decided to check out the material again. I drive past a Home Depot on my way home, so I stopped and checked two sheets of it. Then today, I stopped by a Menards to pick up a few things, and checked out three more sheets there.
I closely examined both sides of all five sheets. I angled it to catch the light to search for imperfections. I ran my hands over it. The grand total number of dimples or depressions or bumps on all five sheets combined was 0 (as in zero, zip, nada, none).
Each of the five was identical, with one slightly textured side that yields a very nice matte white finish that shows almost no glare (a very flat white appearance), and one smooth side that is shinier that did show glare from lights - sort of a semi-gloss appearance. The label is always on the smooth side (all labels stated that the sheets were ParkLand Plastics Plas-Tex Poly Wall, .060" thick, in the color of Bright White). This side was designed to be the "glue side" and I saw some hot-spotting on it with a bright projector.
The Menards store had installation instructions on a tear-off page. Obviously these are written for installing the Poly-Wall as an interior wall panel. But some of it may be relevant for screen mounting. Here's some of what they say:
"The front side is embossed to enhance durability. The smooth back side is treated to accept waterbased adhesives.
After installation panels may be cleaned with non-abrasive all purpose cleaners or soaps. For difficult stains such as felt marker and graphite, use Mineral Spirits or Acetone sparingly. ParkLand back labels can be soaked off with penetrating oil such as WD-40.
Plas-Tex panels MUST be stored flat on a smooth, dry surface.
Plas-Tex panels expand and contract with temperature changes. ... Do not use in structures subjected to extreme temperature changes...
Plas-Tex color matched PVC moldings are available (shows picture of a "clip"-type molding where the Plas-Tex slides in)
(states that panels should not be glued to waterproof surfaces)
Plas-Tex panels should be installed with a quality trowel grade non-flammable or latex adhesive listed in the chart below. Adhesive coverage is about 1/2 gallon per 4x8 panel. ... To insure adequate open time, spread the adhesive on the panel, not the wall. Leave only ridges of adhesive.
Recommended Adhesives: Henry #444 FRP, Liquid Nails FRP #310 Latex, DAP Weldwood multi-purpose Flooring Adhesive, Franklin Titeboard Fast Grab FRP, OSI Sealants Pro Series FRP-555, TACC/Miracle FRP Adhesive.
Not Recommended: All Solvent-based & All tube-style adhesives."
I suspect the installation procedure for using the panels as a screen would be less demanding. Typical installation is intended for panels used in wet or high humidity environments (laundry rooms) for several years of usage with regular cleaning.