Gelcoat Replacement For Fiberglass Pool Repair

by Gary Graham
(Blackstone, VA)

Is there a product that can cover gel coat areas of a fiberglass pool that are gone without draining the pool, such as adhesive sheets?





Thanks for the question Gary

The only product that I'm aware of is called Marine gel coat. This is for for boats and fiberglass pools and is specifically designed for under water applications.

You need to use the right kind of gelcoat because using the wrong kind can result in surface failure within a few weeks. You should be able to order gelcoat from the fiberglass swimming pool manufacturer.

My personal opinion is to allow the fiberglass pool repairs to the professionals. I've assisted with a few fiberglass inground pool repairs and can tell you it's no small feat. And I use the word "assisted", not finished by myself. I was there and saw what had to be done. Those guys were specialists in fiberglass swimming pool repair.

For more information, there's a guy that I've heard about that has done wonders with pools. I've heard of a guy that is in Florida. His name is Paul Pulver and his number is 727 - 798 - 1324.

He's a licensed Florida pool contractor and specializes in repairs and refinishing fiberglass pools. I know you're not in Florida but perhaps he can answer some more detailed questions.

Another good resource that I've used is fiberglass-pool-repair-com. Hopefully this will point you in the right direction.

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

Check back to this post for updates or answers.

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Hope this helps and have a great Summer.

Robert

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Blue Streaks and Patches On Fiberglass Pool

My swimming pool (fiberglass) has developed dark blue streaks and patches.

My husband thinks it may be a build up of calcium I have to get rid of it.

Help any ideas on what it is and what will cure it?

Joy




Thanks for the question Joy

Before I get into the chemical side it would be good to have a complete list of your chemicals:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper).

It makes troubleshooting much easier and the process of clearing up your pool will go much faster. You can get this done at your local pool store. Without these numbers I'm just guessing at what the problem is.

Here are some good posts that are very similar to your problem:

Gray Stains On My Fiberglass Pool

What's Causing A White Coating On Our Fiberglass Pool?

Many fiberglass pool have multiple layers. 1 - 2 gel coats, an epoxy layer, a resin layer, etc...

Now, I had 3 fiberglass pools when I had my pool route in Arizona.

They all had the hairline cracks in them, but they never leaked and were very good with chemicals.

How old is the pool? It could be that the gel coats or epoxy layers are starting to show through. If this is the case you'll need to drain the pool and have it fixed by a certified pool tech.

It shouldn't be calcium because calcium hardness in fiberglass pools isn't as important as the calcium in plaster or gunite pools. Keep the hardness around 50ppm or so and you'll be fine.

If it is a chemical issue, I need the numbers.

Get back to me with the chemical numbers and I'm sure I can help.

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

Swimming Pool Questions & Answers

Check back to this post for updates or answers.

Hope this helps and have a great Summer.

Robert

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Gray Stains On My Fiberglass Pool

by Mike
(Georgia)

Have a 16 X 30 Fiberglass, Inground Pool. Have developed a gray film on the inside walls, floor, steps.

Have tried Stain Remover, Metal out, everything my local Pool Store, has recommended.




Thanks for the question Mike

First, I'd like to have your complete chemicals readings: Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, Metals (iron and copper), Total Dissolved Solids. It makes troubleshooting much easier and the process of clearing up your pool will go much faster. You can get this done at your local pool store. Without these numbers I'm just guessing at what the problem is.

I'd advise you to get a Taylor FAS-DPD K-2006 pool test kit.

Pool Water Testing

Water Testing Kit

First, you need to determine whether the staining is either organic or mineral. Using a Trichlor tablet, hold it on the stain for about 10 minutes. Use a stick or a pool pole, not your finger. You can also use about 1/2 lb. of calcium hypochlorite (granular chlorine) in an old sock to put on a spot.

If the stain doesn't lighten up, gets darker or the color changes to black, it's probably a metal stain. To confirm it's a metal stain, get a Vitamin C tablet (crushed up ascorbic acid), put that in a sock, and place it on the stain. If the stain is removed, you can treat the pool with ascorbic acid.

For a complete ascorbic acid treatment go to this post:

Brown Algae Won't Come Off Of A Vinyl Liner

If it's metals, you'll need a good metal sequestrant. A metal sequestrant does not remove metal from pool water. It holds it in solution until it can get filtered. Then you backwash the metal out. Because metal sequestrants break down over time and get filtered and backwashed out, you need to weekly dose your pool if you have high iron and copper. Metal sequestrants that are based on HEDP, phosphonic acid or something similar are the most effective.

Jack's Magic Blue, Purple, and Pink Pink Stuff, Metal Magic, Metal Free, & Metal Klear are very good.

Be sure any algaecides you use don't have any metals or copper in them. You don't want to add to the problem. A good one is a PolyQuat 60. Remember that algaecides are for preventative measures, not to kill already existing algae.

Hope this helps and let me know how it turns out for you.

Robert

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What Are Dark Marks On Fiberglass Lining?

by Calvin
(Durban)

The pool has recently been fibreglass lined in a medium blue colour.

A few months later there are dark patches (darker blue/blackish) appearing in one area only.

Could this be caused by a low pH or what could be the reasons for this?




Thanks for the question Calvin

My first guess would be a metal problem, probably iron, copper, or a combination of both.

You can take a sample of your pool water to your local pool store for analysis.

If it is iron, one of the best ways to handle this is with ascorbic acid, which is nothing more than Vitamin C.

After an ascorbic treatment, you'll want to use a metal sequestering agent.

This is a chemical that binds with the metals (the metals that come off the surface of the pool after the ascorbic treatment, or metals that are already in the water).

Some good metal sequestering agents are Jacks Metal Free and Metal Wizard.

These agents won't get rid of the metal, but it keeps it in solution, or suspension, until it can get filtered and backwashed out.

The purpose of ascorbic acid is to remove metal stains, especially iron.

You should lower the free chlorine level in the pool to 1 ppm or to zero. It's best to add a PolyQuat 60 algaecide before letting the chlorine drop in order to prevent algae.

Normally the dosage for ascorbic acid is 1 lb. per 10,000 gallons. You should run filter 24 hours and backwash or clean after 2 days.

Test the stain first with a Vitamin C tablet before adding ascorbic acid.

Ascorbic acid may not work for all stains so you'll want to test first to see what type of reaction you will get.

Amazon has good prices and you can go here to purchase your ascorbic acid:

Pool Supplies

Go to Amazon and type in ascorbic acid for pools.

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

Robert



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What's Causing A White Coating On Our Fiberglass Pool?

by Ron and Eileen
(Florida)

We have a white coating that has been forming on our fiberglass pool, and it is getting worse. It is covering the pool whereer the water is, not above the water line.

Usually fiberglass pools feel smooth, this does not.

We have a salt system, and I am wondering if it is from this system.

We tried to lower the water level to clean it but we used several things and none of them worked. We want to get rid of the white coating.

If there is something we can purchase to put in the pool to get rid of it - great. If we need someone to come take care of it, that's OK too.

We just want it gone.




Thanks for the question Ron and Eileen

There could be a few reasons why you're seeing a white coating on your fiberglass pool.

First I would check the chlorine level. Make sure it's correct. Keep it between 1.5 - 3.5ppm.

Next is to check the salt level. Most salt systems allow anywhere between 3000 - 4800ppm.

I would encourage you to get a Myron salinity meter to test the water and also to calibrate it against the reading on your salt chlorinating cell.

You can see a picture of it here:

Salt Water Swimming Pools

The company I use is TMI Salt Pure out of WA state. They're very helpful. Be sure to ask about their salinity water to calibrate the meter.

Be sure to keep the hardness is check as well. It's not so important for fiberglass pools, but don't allow it to get it over 250ppm.

If it does you may need to drain some pool water and refill between 1/3 - 1/2. Too high or low and it may cause etching and clog the chlorinator.

I would say it's possibly the gelcoating on the pool.

On average, to resurface and/or re-gelcoat an entire pool with fiberglass sheets and a gel coat would be around $7000, to the best of my knowledge.

I've heard of a guy that is in Florida. His name is Paul Pulver and his number is 727 - 798 - 1324.

He's a licensed Florida pool contractor and specializes in repairs and refinishing fiberglass pools.

Another good resource would be fiberglass-pool-repair-com. They have alot of knowledge about these things and can point you in the right direction.

Please be sure to go to my site and sign up for my free E-Zine newsletter.

Hope this helps and good luck with your pool.

Robert

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