I was told by some one that I should add some pure plastic cement to my
mortar to install some cultured stone on a wall, said it would help
stick better. What would be a good amount to add to the mortar mix.
What is "pure plastic cement"? Solvent based, chemical based items should
not be mixed with mortar. Possibly you are confused about the additive that
is recommended. It is common to add "acrylic latex admixture" a milky white
liquid to replace all or part of the water. It is used for stucco, tile
setting, repairs, to bond concrete to old concrete and most likely to
install cultured stone. It makes the mortar sticky, hold better, set even
when it appears dry and increases water resistance of the finished product.
You get it at stores that sell tile and/or masonry supplies.
It is easier to just buy "bonding" mortar that already has the latex
in it. If you really want the stuff to stick spend about twice as much
and buy "flex" but that is usually overkill. I put some pavers on a
wall with flex, because that is what I had, and when I tried to chip
one out I ended up having to break it out in little pieces and cut the
mortar out with an air chisel.
Plastic cement is a portland based cement used primarily for stucco
applications it for the most part is treated exactly like regular
portland cement as far as mixing and applications. adding a hand full
to a bagged mix of mortar wil increase the stickeyness while adding a
bit of strength. You could also use lime to increase the stick but I
use the cement because in my experiance it really increases the surface
bond strength where as the lime just adds a bit of stick. Depending on
the stone the bagged mix even a "spec mix" is still a little light on
the cement to make a good quick bond.
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