Posted on

Masonry Water Repellents

Water repellent sealer

How do you choose a masonry water repellent when there are many different types available. Siloxanes, Silanes, Silane Siloxane blends, Silicones, Acrylics.

Siloxanes are available in a water based solution and what is important is the solids content of a individual formula. Siloxanes generally work best when the percentage of solids is 10% and up to 40%. Once the water evaporates, you want the active solids to react within the masonry to form a water repellent polymer.

Siloxanes, Silane blends are available in water based solution. The active solids should be a minimum of 10% and up to 40%.  This blend works best when you have both a dense surface and very pourous surface in the same area to be sealed.

Silanes have a small molecule are are available in 20% solids and 40% solids in a VOC compliant solvent. Great for cold weather application and work best on dense masonry surfaces.

Silanes 100% solids contain high solids and have little or no solvents. They are VOC compliant and work best on very pourous surfaces

Acrylics both water based and voc compliant solvent based. Many different solids formulas available. 10% and up to 30%. Some formulas leave a sheen, some are flat, and some formulas darken the surface. Acrylics allow the surface to breathe but not as breathable as Siloxanes or Silanes. Best when used on very pourous concrete block, split faced block , and split ribbed block.


for more info go to: