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Yes! In soaking the slate, which is a very porous material, you fill the interior capillary and voids with water. This prevents the mix water in the mortar from being absorbed into the slate. The water in the mortar needs to properly hydrate in the mortar mix to get the best bond.

If mix water is allowed to wick into the slate, there is a good chance the slate will not bond well and may fall off the substrate. Especially important in vertical and overhead applications

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15y ago

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