Swimming Pool Floor Concrete Replacement

by Dan
(Oklahoma City)

Pool Floor Crack

Pool Floor Crack

If I have to replace a section (5ftx5ft) of concrete on the floor of my inground vinyl liner pool, do I need to use a special type of concrete?

Thanks for the question Dan

I can't go into much detail on how to go about repairing a concrete section, but there are a couple of things to keep in mind.

You'll want to first cut and sand the affected area, then prime it.

You can prime the substrate with 1 coat of PermaFlex. 1 gallon will cover about 240 sq ft. A cement block surface will need 2 prime coats.

The first coat will penetrate the substrate, then it cures.

You can also use a product called E-Z Joint Seal Self-Leveling Expansion Joint Sealant. This is an oxime neutral cure 100% silicone rubber expansion joint sealant.

You should allow the crack to dry. Wipe away the dust and debris.

Put a bead of caulk along the crack. You'll want to leave 1/4” space to allow the plaster to cover the caulking.

Let this dry.

Use a general pool patch or white Portland cement with white sand and water, and an acrylic cement bonding agent.

This can be found at Lowes or Home Depot.

Your mix should have the consistency of peanut butter.

A liquid rubber base and thickening activator (LRB/TAV mixture). Mix 2 parts of LRB and 1 part TAV. You'll have a mixture that can be applied in one application.

This is for information purposes only and will give you a starting point.

If you have any doubts about the repair, please contact a local pool professional that can handle your situation.

Hope this helps and have a fun and safe swimming season.


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Inground Pool Steel Walls..Should You Use Foam On The Walls?

by Don

I am having a new inground pool installed the contractor suggested not to use foam on the walls as this may contribute to the steel walls rusting sooner. He suggests that the foam keeps condensation behind the liner which causes this to happen.

What is your take on this?

Thanks for your question Don

I know this is an area of concern for new pool owners, so here's my take on the issue.

Many people have had wonderful success with adding foam with their vinyl pool liners, but normally this is when the pool walls are so rusted or worn down they cannot be repaired, scraped or sanded.

There are good points and bad.

Good - Adding a layer of pool foam can protect the liner from rubbing the pool floor and walls. It protects the liner from the pool. It also feels softer to the touch, hands and feet, with an added layer.

Pool foam also helps with insulation and heating of the pool water.

Bad - With a layer of foam around the pool, your liner will become more susceptible to tears and punctures from the outside. Take a piece of foam, put a small piece of vinyl on it, then puncture it with something sharp. Put the piece of vinyl on a hard surface and do the same thing.

You might get a smaller hole on the hard surface, but not as bad as having foam. And that might be what your contractor is talking about. If a sharp object goes through the liner and foam, you might have a problem with leaking or condensation.

If your new vinyl liner is seated correctly, there shouldn't be any seams where water can get through, but even the best contractor cannot see the smallest seams and there is always the risk of leaking and rust.

My advice would be this:

I think whether you have pool foam or not, if there's a split or tear in the liner, water will get through and you might have rust spots. It's really only as good as the vinyl liner itself and the contractor who is installing it.

Pool foam is very good under some conditions, as was stated, if the pool cannot be repaired. For a new pool, you might want to reconsider pool foam because of the added, and possibly unneeded expense. But, you do run the risk of replacing the liner earlier because of the rubbing of the vinyl liner against the pool.

The condensation part is debatable.

Hope this helps and good luck with your new pool


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Underwater Product To Recoat Small Pitted Areas

by Douglas
(Tampa, Florida)

I thought there is a product one can use which is like underwater paint, in order to coat small pitted areas at the bottom of inground pool.

Thanks for the question Douglas and sorry for taking so long to get back to you. We're int he process of moving to Palm Harbor, Fl in the next month.

A waterproof cement will work and can be purchased at most pool supply stores. You'll want to enlarge the crack a little bit to give the patch a better hold.

There's also a good cement from the Pool plaster repair with the George L Throop Company.

Another good product is called E-Z Patch. This is a white pool plaster repair kit that are available in 1, 3, 10 & 50 lb. & kits. They're designed for underwater or above water repairs.

There's also Patch It from Leslie's which works well.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Repairs" category.

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

Contact Me


Hope this helps.


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