« Reply #67 on: November 16, 2014, 10:48:57 PM »
How about moisture content in the concrete? Doesn't that need to be measured, and be within a certain range? ... or maybe a 'no greater than' type of number?
I am guessing there are probably a whole lot of factors that can contribute to it not working well (or working fine). How old the concrete is, the type of concrete, the humidity, how it was cleaned, what chemicals were used, how long the etching was left on, moisture content of the slab, application temperature, the age of the kit, the formulation the factory used, what previous contaminates might have soaked into the surface before it was cleaned, etc, etc.

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