September 29, 2006, Newsletter Issue #33: Applying Water-Repellent Coatings

Tip of the Week

So, you've gathered some waterproofing tips and have chosen the waterproof coating that's right for you (hopefully). It's time to roll up your sleeves and put on your coat. • Applying the Coating: Before you apply water repellent, there's something you should know: Allow the mortar in new masonry walls or freshly placed concrete to cure fully—for at least 28 days—before applying. Make sure your surface is clean and free of any dirt and oils. Otherwise, your coating won't go on right. If you have to do general or spot cleaning, let the surface to dry thoroughly before applying the coating. If there is a nearby air-conditioning unit, turn it off while applying the coating. You don't want fumes getting sucked into the air intake. • Protect Adjacent Surfaces: Use plastic sheeting to cover windows, doors, and any surfaces you don't want coated; tape in place if necessary. Also cover grass, bushes, and any plants in the work area. • Cut In at the Edges: Always prepare the water repellent product according to the manufacturer's instructions. Use a brush to paint around the edges of the surface you're protecting. Use long, even strokes that do not overlap too much. • Start at the Bottom of the Wall. Put your coat on from the bottom up. Dip the roller in the pan and roll upward in a long continuous vertical line. Don't be afraid to saturate the wall. There should be a 6- to 8-inch rundown below the contact point. • Let the coating soak into the surface for two or three minutes and then saturating the surface again. Once the first coat is dry to the touch, put on a second saturating coat, just like the first.

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