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CCAT Natural Exterior Wall Plaster & Paint, part 2
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=== Applying Color Coat === Like the slip coat the color coat is applied with a brush and roller. I chose a lime-wash in order to use materials already at hand, and once again reduce extraneous variables from the experimental aspect of the project. Because I wanted uniform color this layer was not done in four strips but several continuous coats covering the entire surface. Work from top to bottom this time so that you can smooth over drips as you progress. Most people will probably need to use masking tape to protect the edges. With my painting experience I managed with a brush, using a bucket of water and clean rags in case I slipped up. Consistency of the lime-wash should be about that of whole milk.<ref>'''Guelberth, Cedar Rose & Dan Chiras. The Natural Plaster Book: Earthen, Lime, and Gypsum Plasters for Natural Homes. Gabriola Island, BC, Canada: New Society Publishers, 2003.'''Of all the books I read through, only one did I find myself drawn back to over and again.... This book seemed to have, compared to others, the most agreed upon and middle-of-the-road recipes; I derived all my basic formulas from it and barely scratched the surface.</ref>Make sure it is well mixed so that pigments will distribute evenly throughout. Also, experiment ahead of time to get your colors right; lime bleaches out color so you probably won't get darker than a pastel, remember that the lime-wash will dry lighter than when it is wet. Be sure to use drop-cloths and protective gear as lime-wash will likely spray off the roller as you paint. Thickness of this coat will likely be less than 1/8 or even 1/16 an inch,<ref>'''Guelberth, Cedar Rose & Dan Chiras. The Natural Plaster Book: Earthen, Lime, and Gypsum Plasters for Natural Homes. Gabriola Island, BC, Canada: New Society Publishers, 2003.'''Of all the books I read through, only one did I find myself drawn back to over and again.... This book seemed to have, compared to others, the most agreed upon and middle-of-the-road recipes; I derived all my basic formulas from it and barely scratched the surface.</ref>don't worry as long as you cover all the area as you paint, be sure to dampen the surface with water first. You'll be able to see as you work whether or not you are getting full coverage, if not, more paint, just watch for runs. I used three coats because I had enough wash. I think two would have worked nearly as well, but just one coat did not blend my four plaster strips together color-wise; a surface with a uniform plaster could probably work with just one coat if you were not concerned with matching an exact color, (a washed or stained-type effect). <center> <gallery> Image:CCAT natural Plaster; after first color.jpg|fig. a:Note how one color coat doesn't cover well over my multi-colored surface. Also, the wall is dryer on the left, note how much the lime-washes fade to pastel as they dry. Image:CCAT natural Plaster; after second color.jpg|fig. b:After the second color coat still patchy, (this is a darker, still wet photo). Image:CCAT natural Plaster; finished wall front.jpg|fig. c:Third coat, all dry so quite lime-bleached, but looks smooth and more solid; can't see through the color, the washed-out effect, nearly as much. </gallery></center>
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