A burn from a caustic source can be as dangerous as burn from an acid source. Whenever using unslaked lime, we always had a bottle of caster oil in our pocket. I you add the water to the lime, there could be an explosion and any bystander could be badly burned. Never put the lime into the box first and the add the water. Water was poured into the same sized mixing tub as the brown coat had been mixed in, but never the same tub. That was an easy job compared to mixing of white coat.įor white coat, we used "Unslaked" white lime. to just the right consistency and with no lumps. The water had to be added at the very start in just the right amount and mixed very quickly. that hoe was at least four or five times larger than your every day Home Depot garden hoe that most are familiar with today. For Brown coat, we (I) used a big "mortar tub" was dumped one or two bags of plaster into which water was added as plaster and water was mixed with a very large hoe. That was usually my job.Įventually, we got into "White coat" that was even more fussy. the brown coat had to be mixed perfectly every time.
"Brown coat" base was, except for the material used, just like stucco that we did over foundation, mostly over blockwork. At some point along the way, we got involved with plastering. The main part of my boss's trade was stone work. Way back when I was just out of high school, I got a job as an apprentice (translation: gofer) mason.
General Service Administration - Selected Reading on Lath and Plaster. Detailed descriptions of recommended surface preparation and application procedures. Recommended ratios for brown coat, scratch coat, etc. General Service Administration - Lathing and Plastering Walls and Ceilings. General information on plaster, restoration techniques, etc. National Park Service - Technical Preservation Brief 21 - Preserving and Restoring Flat Plaster. Not sure how much experience you have with plaster, so this might be more background information than you need.
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