Paint Coming Off Newly Built Pool

by Jane

Swimming pool has been rebuilt with 100m reinforced concrete and overlayed with fibreglass sheets and resin.

The pool paint used is coming off in small lumps and there are brown rust spots all over the paint. Can we repaint with an epoxy paint to rectify this?

I am the President of a complex here in Fuerteventura and have a hundred apartments to look after and keep the owners happy.

Thanking you in anticipation.


Thanks for the question Jane

I was wondering if the resin is coming through the finish. This is known as Cobalting. The inner layer of the fiberglass is separating.

The only way to stop the resin from doing this is to grind it out and fill it with a rubber based filler. This might occur in different areas of the pool.

It might be coming from the outer shell and work its way in.

Epoxy paints are suitable to paint a shell and some only require a primer and finish coat. But here's the thing...

Some pool paint manufacturers say that epoxy paints are not normally used for outdoor pools. They say to use a rubber rubber based paint for pools that have alot of UV sun on them.

The brown spots could be rust coming from underneath the concrete and fiberglass. If this is the case, it means that water is somehow getting under the shell and concrete causing rust to form.

Painting with a rubber based paint could solve this problem, but with a chlorine pool, eventually the paint will break down over time allowing the water to seep back into any cracks it can find.

Paint coming off a freshly painted is pool is normal and will decrease as the pool is used, filtered, and back washed. Chunks of paint and rust is not normal and should be treated.

I would call the people back who did the job and explain the situation to them. It should have been done right the first time. If the concrete wasn't sanded and any cracks repaired properly, you're going to have this problem.

Here's a link to my pool paint page:

Swimming Pool Paint

Hope this helps and have a great Summer.


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Pool Paint Bubbles & Blister...What Could Cause This?

by Donald

My pool was tanked and then insulated on the inside then rendred with water proof render.

I have now painted with chlorinated rubber.

It is starting to bubble/blister.

What could be causing this?



Thanks for the question Donald

I have a full page on pool paint. Here it is in case you missed it:

Swimming Pool Paint

I copied and pasted a paragraph right from the page:

Bubbles And/Or Blisters

"This is caused by improper preparation. For diy pool resurfacing, the paint must be applied to a clean dry surface.

If applied too thick, if the surface is too hot, and if the pool is not cleaned properly, the pool paint might blister.

The only remedy is to repaint the pool or the blistered spots."

This is actually the only remedy I know of.

The first coat of paint penetrates and fills the surface. This gives the coat strong surface and adhesion.

Every application after that is normally 5 - 7 days. After the 2nd coat you should wait another 5 - 7 days before filling the pool.

The paint might feel dry, but may not have cured properly. If the pool if filled too quickly you might get blistering, bubbles and/or peeling.

If the weather is cooler or the air is humid, you might need a longer dry/cure time.

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


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Removing Cement/Glue From Top Of Pool

by Susan

We had someone come in & put tile around the top edge of our fiberglass pool. The guy didn't know what he was doing, and tiles started falling off.

We have since pulled off all of the tiles (mold & mildew was collecting in grout,too). There is still a lot of cement/glue still present on the fiberglass edges. Dirt, etc. now collects on the cement and it looks awful. We are trying to sell our home & want to get this stuff off.

We tried scraping, but there is a lot that will not come off, no matter how hard we scrape. Is there a solvent or some kind of chemical that will remove this stuff without harming the fiberglass.

Thanks for the question Susan

Here are a few things I used to remove grout and cement. I'm not aware of any chemical that will completely remove everything. This stuff is basically like cement and will take some work to remove it.

You can use a tool called a grout saw. It's shaped like a screwdriver with a blade on the end. You can also use Grout Scrubbers. They're similar to a Brillo Pad and a set of 12 will run you about $15.

Muriatic acid mix 2:1 with water. Be very careful with this as just a few drops on your skin will have you running to the faucet to rinse off. Muriatic acid is very caustic. Always add the acid to the water, not water to the acid.

I've never used a Dremel Tool on pool grouting but I did use when I refinished the hearth around my brother's fireplace. It worked perfectly and has many attachments. I was able to remove hardened chunks with precision.

Lestoil Concentrated Heavy Duty Cleaner from Clorox. You can find this at hardware stores like Lowe's and Home Depot.

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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