I expect that you are looking to apply a thin coat of
material say in the range of 1/8” – 3/8”.
In this instance I would suggest you use Xypex Megamix I mixed, per the instructions,
with Xypex Xycrylic admixture. The
substrate should be prepared to a CSP 3 which is the equivalent to a heavily
sandblasted surface. This can be
achieved in a number of ways but a 5000 psi pressure washer, and if required a
grit introduction nozzle in conjunction with this, should do it.
If you need to apply a thicker coating, Xypex Megamix II can
be used for a layer of ½” – 2”. Again
use Xypex Xycrylic mixed at 1 part Xycrylic to 2 parts water as the mix
liquid. In this instance you may need a
slightly higher surface texture.
The substrate should be saturated surface dry just prior to application
of the top parge coats. Apply a scrub
coat to the substrate then the mortar.
Neither of these top coats need to be cured unless you are
in extremely dry conditions.
Call me at 604-273-5265 if you want to discuss further. Jim Caruth
Posted on 07 Apr 2014