OR many years considerable de•
rnarid has existed for paints that
;reduce textured rather than conven• tional smooth films on ceilings and in• terior walls. By virtue of their texture, such paints have been able to serve r::e extremely useful purpose of con• ceaiing surface imperfccrions such as ,::0sc! resulring from cracked plaster and irom spot peeling of thick. films of ~Jint built up in years of repainting.
:-S!Jr.•.1focturers and users both have s ee n an evolution that has brought rhese textured coatings from conven•
..cnal pain] mcchunicalty textured after app.icaricn 'and prior ca• drying to those
• containing actual particles. • One such particle appears to. offer the .greatest
-cdvr.ntages in elimination "of settling and added bulk value. This material, called perlite, is produced by heating of certain volcanic rock, causing it to pop much .::s popcorn, producing a light• weight, high-bulk stable material with suited in the tapered rather than square butt edge. Thus, the , adjacent edges of panels combine to produce a gradual yet definite tapered channel that forms a repository for spackling compound and tape. This design fea• ture, combined with a finishing sanding operation permits total concealment of joints without protrusion of patch• ing compound above the surrounding
surface

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