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Posted by on December 22, 2007, 5:38 pm
I tried to 'skim coat' a floor-to-ceiling mid-century fireplace - red
brick over concrete block construction. Here's what I tried without
success (looked great for a few days then fell off): thinset (acrylic
fortified) over the brick, then a finish coat of portland cement steel
trowel finish. The finish coat went on after the thinset had fully
dried - a few days or so. I wetted the thinset coat well before
applying the cement finish coat, however. I fully expected this to
work. The 'polido' finish is common: fine cement stucco over concrete
block with a final portland cement slurry troweled over to a polished
finish. Drying conditions affect adhesion of the polido so I was
careful to manage the drying of my fireplace polido accordingly. As it
turned out, some sections of the finish adhered perfectly but much of
the work is cracking and falling off.
I'd appreciate guidance on how/what I can get to work with the dry
thinset coat and why my polido finish is falling off. I'm assuming the
acrylic prevented a good bonding with the cement. Not sure why parts
of the finish are good and others not. If the acrylic is indeed the
problem what should I use as a new intermediate step to bridge to the
polido coat? Thinking Sika something.
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