Proper application is necessary to ensure the glass block structure remains stain-free. Even a small gap in the sealant will allow fluids to seep into the mortar, defeating the barrier provided by the mortar sealant.
Things You Will Need
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Pour liquid mortar sealant slowly in a spray bottle. Do not allow air bubbles or foam to accumulate inside the sealant.
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Move to the highest horizontal mortar line of the glass block window. Hold the tip of the spray bottle nozzle 1/2 inch away from the mortar joint. Spray sealant on the joint as you slowly move the bottle along the seam. Spray the remaining horizontal seams. Spray a light coat of sealant on all vertical mortar seams.
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Rub the sealant into the mortar joints using a lint-free rag. Wipe the surface thoroughly until all excess sealant has been removed from the surface of the glass blocks. Allow the sealant to dry for 45 to 60 minutes.
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Buff sealant residue from the glass blocks, by wiping across them with a clean lint-free rag. Move the rag in a circular motion if the hazy residue is difficult to remove.
The Drip Cap
- Stains and mold are common on the porous mortar that holds glass blocks in place.
- Do not allow air bubbles or foam to accumulate inside the sealant.
- Spray sealant on the joint as you slowly move the bottle along the seam.
- Rub the sealant into the mortar joints using a lint-free rag.