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CCAT Natural Exterior Wall Plaster & Paint, part 2
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=== Applying Scratch Coat === Finally I started to apply my plasters, #'s 2, the Lime Plaster finalist, and 4.3, the Manure Plaster finalist, in four strips, one of each over each of the two sections of wall. I assumed the materials would bond better to themselves, so resisted the urge to use only three strips: manure, double-wide lime, manure, for instance. It would give the middle strip an unfair weathering advantage, another excess variable to be eliminated. So four strips it was: manure, lime, manure, lime. Notice that this arrangement made sure both plasters got to rest upon the wood end-posts as well as the plastic window. These four applications added a lot of time to the project that would be avoided in a non-experimental one plaster application. Keep that in mind if you decide to try one of these plasters yourself, it'll go easier on you. The Scratch or Key Coat is intended to be rough, providing lots of nonuniform, porous and bulbous surface for the next coat to adhere to.<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>I intentionally used too long straw pieces, regular 1-3 inchers, but some possibly as long as seven inches. Leave the straw sticking out, this too provides extra key.<ref>Pennelys Goodshield</ref> I chose not to apply the scratch with a trowel as this would be too smooth. One traditional European method to apply lime plaster is called hurling and means throwing handfuls of plaster at the wall.<ref>"Plastering with Natural Hydraulic Lime (The How To Guide)"; Andrew Morrison; Straw Bale Innovations, LLC; 7803 Sterling Creek Road, Jacksonville, OR 97530. 2007. A video, this is 'how-to' info for the visual learners.</ref> I did not discover in my researches how plasterers traditionally protect themselves from lime burns. '''''remember: lime is caustic and will cause chemical burns, wear goggles at all times and keep vinegar on hand as a chemical counter-agent to treat burns.'''''<ref>http://www.jtbaker.com/msds/englishhtml/c0462.htm</ref> As to hurling, for fear of chemical burns I found it too aggressive a method, messy as well. Instead, first moistening with water I created a similar effect by slapping handfuls of plaster onto the wall, wearing my protective gloves. This filled into previous nooks and crannies while leaving plenty for the next layer to adhere to. Aim for a thickness of 1/4 to 1/2 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>
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