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If you are using a concrete substrate as the base, the concrete should be free of any construction debris and any barrier [like paint or drywall texture] that may be on a surface.

You should waterproof the host concrete material 1st before setting the bed. I recommend using a product called StableCrete to waterproof the concrete. This will give your mud superior adhesion to the concrete and will also prevent moisture from coming Up through a slab to cause bond problems at a later date.

Cement based grouts are very porous and will absorb water and stains dropped on a floor surface. If you waterproof the grout joints you will see years of an original color joint not subject to absorbing contaminates. This also prevents moisture from migrating down into a grout and penetrating to the bottom if a tile where that moisture can compromise the tile to mud joint bond. If you have ever had to remove grout, pull up tiles, re-mud with thin set, reinstall your tile and then re-grout, you will appreciate your waterproofed bonding!

[Not for use on Polymer based grout]. Essential for longevity and maintenance of any concrete or cement grout to waterproof it!

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14y ago

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