SEMCO LIQUID MEMBRANE™ in concrete pool application

SEMCO LIQUID MEMBRANE™ in concrete pool application

Painting your old pool with SEMCO Liquid Membrane™ to waterproof it and make it look like new again!
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In this guide we’ll be getting down to the business of prepping and painting your pool.Let’s get started!

Step 1: Time Your Pool Painting Project

The weather and temperature have everything to do with how well and quickly a pool painting project will go. Typically, you should try to find a stretch of time of a minimum of one to two weeks where there will be no rain. This can be a bit tricky during springtime.

Avoid application if the temperature is below 50°F or above 85°F, or if it is extremely humid. Avoid high winds that blow all kinds of debris into your pool during the application or drying period.

Step 2: Prep Your Pool for SEMCO Liquid Membrane™

Prepping your pool for SEMCO Liquid Membrane™ includes:

  1. Draining the pool
  2. Scraping away loose paint; repair and fill any cracks or hollow spots. For fiberglass pools we recommend also a light sand across the surface.
  3. Rinse and scrub with our products for surface prep
  4. Rinsing the pool to remove any surface prep residue
  5. Pump out any remaining water and let dry completely (3-5 days depending on weather conditions)
  6. Mask off any lights, tiles, and fittings with painter’s tape

Step 3: Apply SEMCO Liquid Membrane™

Now that your pool has been prepped and is completely dry, we’re ready to paint to apply SEMCO Liquid Membrane™. Remember to mix the product thoroughly. Use a power drill with a mixing paddle to ensure that your the color pigment is mixed properly. When painting you want to start at the deep end and work your way to the shallow end. Use a telescoping pole to reach all the way up the walls.

Use a short nap roller, 1/2” inch nap roller, for smooth surfaces. Buy a wooden extension pole that you can screw into the roller frame so that you can roll the paint more easily. Overlap just slightly and use an even pressure for the best finish. Use a small cut-in brush to handle the 90 degree corners around steps and swim outs.

Submerged applications need a minimum of three coats of SEMCO Liquid Membrane™, each at 15 to 20 mil, at about 100 sq ft per gallon. Never rush the next coat: recoat only when the previous one holds no fingerprint, which can take a few hours depending on temperature, wind and humidity. Work fast but steadily and monitor the amount of product that you are using, so that you don’t end up running short on paint, or having much left over.

Step 4: After Painting the Pool

You have finished painting the pool. Looks good, doesn’t it? You can now remove any painter’s tape. Before thinking about doing anything crazy, like filling the pool with water right away – make sure you have given the SEMCO Liquid Membrane™ sufficient time to cure. That is at least 7 days, and longer in cool or humid weather or if the coats went on thick. If you get any rain or moisture during the drying time, make sure you are removing the water as fast as possible and allowing for extra dry time if the rain lasts for more than an hour or two.

Step 5: Filling the Painted Pool

When the pool paint is completely dry:

  • Fill the pool with water without stopping until full
  • Balance the pH, alkalinity, and hardness levels
  • Start up the filter system and add chlorine through the skimmer or a floater, never directly onto the shell
  • Add chlorine stabilizer and stain away
  • Resume your normal chemical maintenance

Enjoy Your Painted Pool!

Now the only thing to do is to enjoy the fruits of your labor!

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Questions about this guide

Quick answers.

How long does a concrete pool need to dry before coating?

Days, not hours. After draining, cleaning and rinsing, let the shell dry until it is at 3% moisture or less, which usually takes several dry days. A newly poured or replastered shell should cure about a month before it is coated.

Where should I start rolling in a pool?

Start at the deep end and work toward the shallow end so you never have to stand on a fresh coat. Use a 1/2-inch nap roller on an extension pole for the flat areas and a brush for the cove, steps and fittings.

How long do I wait before filling the pool?

At least 7 days after the last coat, and longer if the coats went on thick or the weather was cool or humid. Filling early is the most common reason a pool coating fails.

What do I do after filling a newly coated pool?

Fill without stopping, then bring pH, alkalinity and chlorine to normal levels and keep them there. Dose chlorine through the skimmer or a floater; never drop tablets or granules onto the shell, because the concentrated chemical can bleach the coating where it sits.

What weather do I need to coat a pool?

Pick a dry stretch of at least one to two weeks, with temperatures between 50 and 85°F, out of direct midday sun, and low wind. Rain on an uncured coat means redoing it.

Still unsure? Call 1-833-211-2297 or email info@semcoworks.com before you start.