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Can I Paint Over Thompson's WaterSeal on Concrete?

By Keith Allen ; Updated September 21, 2017

You can paint concrete that's been treated with Thompson’s WaterSeal if you follow the proper steps. You should not paint over Thompson’s WaterSeal Advanced Clear, however. Proper preparation of the concrete and adequate drying times are required before you can start painting.

Applying Thompson’s WaterSeal

Apply Thompson’s WaterSeal to concrete that has cured at least 30 days. Apply the sealant only if the temperature is above 40 degrees and the surface can be protected from moisture, such as rain, for at least 24 hours. Allow the first coat to dry at least 48 hours and test to determine if a second coat is needed. Sprinkle a few drops of water on the concrete. If beads of water form on the concrete it is sealed. If the water is absorbed, producing a dark spot on the concrete, a second coat is required.

When to Paint

Apply oil-based paints to concrete treated with Thompson’s WaterSeal at least one week after the application of the sealant. Apply latex paints 45 days after the Thompson’s WaterSeal application. Follow label instructions from the paint manufacturer concerning application processes, temperatures and cleanup.

Monitoring the Product

Check the waterproof status of the painted surfaces about once a year. Place a few drops of water on the surface and monitor it for absorption. Beads of water on the surface indicate the concrete is still waterproofed.

Safety Procedures

Apply Thompson’s WaterSeal in a well-ventilated area and avoid breathing concentrated vapors or mist from sprayers. Wear proper eye protection and rubber gloves while applying the product. Use a paint thinner or mineral spirits for equipment cleanup. Rinse all equipment with clear running water after the initial cleaning.


About the Author


Keith Allen, a 1979 graduate of Valley City State College, has worked at a variety of jobs including computer operator, medical clinic manager, radio talk show host and potato sorter. For over five years he has worked as a newspaper reporter and historic researcher. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines.