Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Removing lacquer sealer from stamped concrete patio?
Q. I want to remove old sealer from my stamped embossed concrete patio. The patio is 5 years old and has been sealed several times. Now the sealer has turned white. The sealer is Dustone Clear Lacquer Sealer. I have tried paint thinner, acetone to no avail. Today I put on Kleanstrip KS-3 premium stripper. That did take some of it off but it left it whiter than before. The concrete is brown. I'm tempted to paint the patio. That seems easier than removing the sealer which I think is on for life. My questions are:
1. Has anyone had any luck removing this type of sealer from concrete?
2. Did anyone paint over the concrete and how does it look?
Thanks,
Frank WikerCPI - Manteno, Illinois
2004
A. Try using lacquer sealer stripper from Glaze N Seal. We use their sealer and never have the efflorescence problem. Also Xylene
⇦this on
eBay
or
Amazon [affil links] is nice for clean up and dilution. Some sealer manufactures also sell a tinted sealer. When it comes to sealer you get what you pay for. Don't be cheap. I've been using Glaze N Seal for years and never a problem.
It costs a little more but worth it.
Concrete - Sparks, Nevada
2006
Q. I also have a stamped colored patio, But I used a saline sealer called Weather Worker S40(J-29) and following the contractor's specific instructions, sealed it twice a year. After the fall application in the second year, my patio turned white. The sealer manufacturer said I had saturated the patio and that I should have applied only every 3 to 5 years. I tried a product called Dicone NC-9, but it didn't work very good. The white film came back even worse. Can anyone give me some suggestions or advise?
John Michael- Springfield, Ohio
2006
Q. We just had a concrete slab poured for outdoor patio that was powder colored and stamped. The contractor came out this past weekend and applied sealer and it came out milky white in several large areas of the patio.
Will this disappear over time?
If not, how can it be fixed without damaging the colored concrete?
If nothing can be done, what recourse do I have legally as a consumer?
Please help!
- Lakewood, California
2007
A.
To take off your sealer use a sandblaster it will peel it right off.
Anthony Burkholder- Shannon, Illinois
2007
Q. Will sandblasting off sealer on stamped integrally colored concrete affect the look, color, texture of the concrete? is that the best way to remove old sealer?
Lisa Montoya- Lake Forest, California
2007
Q. Last year I painted my concrete patio and sealed it with the sealer recommended by my local store. However the rains easily penetrated the sealer and the paint underneath blistered and peeled. I have gotten the old paint off, applied a stain this time instead of the paint and am now looking for a good sealer that can be applied over the paint that will keep the rain from ruining it again. Most of the sealers I look at indicate that they should not be used over paint.
Tom Englishbuyer - Oceanside, California
April 19, 2009
Q. I have used Glaze N Seal on my colored concrete pavers on my patio for 19 years. I have always been happy with the results.The last two times I had a problem with it turning white. Now I need to strip off all the layers of lacquer sealer. It's a large area, 600 sq. ft. What is the best way for a home owner to do this and what stripper should I use. Or is this a job for the professionals?
Jane welther- Los Angeles, California
July 18, 2009
A. Sandblasting: MUST be done by a professional otherwise it will damage the stamped surface.
Xylene
⇦this on
eBay
or
Amazon [affil links] can be used to remove the sealer.
best when a sheet is laid down on the area and saturated, let dry then peeled off.
Milky sealer: Means there was excess moisture in the concrete when the sealer was applied and will NOT go away.
Hope this helps.
concrete - Ottawa, Ontario, Canada
May 6, 2010
A. I have a stamped colored concrete patio (dark brown) and sealed it several years running with expensive resin type clear sealers. The last two years it has given me the milky white and patchy look many of you describe. I have talked to a lot of pros and gotten a lot of shrugs but one guy recommended Toluene (Xylene) so I'm currently trying that. I've sprayed about half my patio and it looks good so far with the original color coming back. I hold my breath and spray small areas at a time because I'm worried about inhaling the chemical. Meanwhile my cheap garden sprayer ⇦this on eBay or Amazon [affil links] stopped pumping and I think the Toluene may have broken down the O ring in the pump. Anyway I think Toluene is going to do the trick. I'm afraid to put sealer back down now.
Fred Huggins- Jonesboro, Arkansas
July 14, 2010
A. The contractor put the sealer on my stamped concrete patio before letting it dry and it bubbled up and turned white. A friend pressure washed it and put sealer on again. I have never been happy with it. We got a soygel cleaner from the contractor and used a pressure washer. This turned it sticky and black. We have used three gallons of stripper/cleaner at $81.23 a gallon. Yesterday we picked up Strip Eze for $23 a gallon. Use a stiff brush, not metal, and work it in and pressure wash it off and it looks beautiful. It takes a lot of time, but I will finally have the patio I wanted. We will put a clear diamond sealer on it when finished and dry.
Lora Pine- Pendleton Oregon
August 8, 2010
A. PLEASE PEOPLE do a little homework before you choose a sealer for your concrete. Concrete takes 28 days to fully cure! Most sealers, when applied before a full cure, trap moisture inside the concrete and will become white and peel! Don't let your contractors apply a sealer before 28 days unless it is specifically designed to be applied to curing concrete, and even then I would be careful. As you can read from above, a little wait is much better that the alternative!
Jesse Florquistconcrete artisan - Casper, Wyoming
August 25, 2010
Q. Has anyone tried muriatic acid ⇦this on eBay or Amazon [affil links] ?
Kevin kovacs- Edmonton Alberta Canada
September 13, 2011
A. MURIATIC ACID WILL NOT HELP ON A CONCRETE SEALED STAINED PATIO. I TRIED USING IT FULL STRENGTH.
RICHARD RAYCHER- PARMA OHIO
April 20, 2012
A. Hi, I have experienced the same problem of sealer turning white. In general I have this occur with water base sealers "Concrete Wet Look". I have not experienced this when using an oil base sealer for the first 10 years of sealing the concrete. Having used water base for 3 or 4 years now my concrete deck is far from the original color and I am now peeling the sealer layers off with a pressure washer one centimeter at a time.
Tim Van Egmond- Calgary, Alberta
April 18, 2015
Q. I'm considering painting "Surface Giant" over my stamped concrete. My patio has turned white and a milky color. Before painting I was going to use a pressure washer [affil links] to clean it. The salesman for Surface Giant said it should not be a problem painting over after that. Does anyone know if this will take care of my problem or am I wasting my money. Will the paint last or will it also go bad? Any help will be appreciated.
Ron Coppola- Fresno, Calif
June 10, 2015
|
Hi Ron. We try to avoid testimonials to a particular brand because it leads to spam and postings by salespeople posing as satisfied customers. And if we post an anti-testimonial, we sometimes hear from the vendor that we need to prove the validity of the complaints, which we can't do -- with the result that when a brand name is mentioned, the comments tend toward unrealistically favorable :-( But to the general question, I don't think I'd expect chemical incompatibilities between an old topping and a new, but see the posting below from Tanya Schifone. Whatever doesn't come off with a pressure washer probably has sufficient adhesion that the new coating will stick pretty well. The vendor's rep told you it will work, and you have no particular alternative -- so it sounds promising enough to try :-) Regards,  Ted Mooney, P.E. Striving to live Aloha finishing.com - Pine Beach, New Jersey July 2015 |
Q. I need to remove the sealer and maybe stain from my stamped concrete patio. I've been told that by using "Soda Blasting" that this would remove it all. Can someone tell me if I can do this and how it's done?
Angel FelicianoHome owner - Northampton, Pennsylvania USA
June 8, 2015
July 13, 2015
A. I have no way to know how deep the stain is - it may be all the way through; nor how thick the coating is, but -
If they are both just on the surface, then blasting with dry soda, frozen CO2, fine sand, plastic media or walnut shell media
⇦this on
eBay or
Amazon [affil links]
, or any other abrasive media will work.
But it's not a process you can do yourself.
I'd ask the person who installed it.
Jeffrey Holmes, CEF
Spartanburg, South Carolina
A. Home Depot has a premium coatings remover that works. Xylene
⇦this on
eBay
or
Amazon [affil links] and a pressure washer (heated) also work.
As an alternative you can put a new solvent based acrylic over what you have down. Solvents can recoat solvents; water recoat water. We have several acrylics that can be used to reseal concrete.
- Nashua, New Hampshire
October 2, 2015
Problems Sealing Acid Stained Concrete
Q. I recently acid stained my stamped concrete. I waited about 90 days to make sure it was cured. I would like to seal it and was told the best sealer would be Glaze and Seal. I plan to spray it with a low pressure sprayer. I am concerned because I brushed on the glaze n seal in a corner with a brush and noticed small bubbles that eventually dried up to what tiny specks. I'm hesitant to apply it now because I am fearful it will leave a bunch of bubbles or blisters. The weather is not hot nor humid here. I would say it is about 60 °F outside.
Any advice will be appreciated.
Thank you.
HOBBYIST - Vallejo California
November 1, 2015
Improper treatment of concrete pavers
Q. A worker used an electric rotating machine that had a large circular head to clean my beige concrete pavers. This machine left circular marks and changed some of the beige color to gray. The patio looks terrible. The pavers were installed a year and a half ago. What can be done to restore the original look of the pavers?
Carol TaylorHomemaker - Fairfax,Station, Virginia, USA
April 16, 2019
A. Hi Carol. You'd probably like an easy and highly permanent answer but I doubt that there is one. What I'd probably do is paint them with an exterior paint made for the purpose (maybe a garage floor coating if there's an affordable one), but with a sand grit/texture so people don't slip on wet pavers. Make sure it's a UV-resistant coating though, because the sun will quickly bleach it if not.
(Two Stop Signs: one probably UV-resistant and the other not. No, this isn't an old yellow & black sign, it's a formerly red & white one)
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
May 2019
Sealed concrete is now looking white
Q. The person that did Stamped Concrete floor for me, polished it after two days. Now the floor is looking whitish. How can this be corrected. He mixed his sealer with Xylene and even tinted the color while polishing it. Kindly advise.
Uchechukwu Oji- Lagos City, Lagos State Nigeria
June 3, 2020
A. Hi Uchechukwu. Uh oh, that whiteness sounds like it could be an oil-and-water emulsion from mixing incompatible liquids. Has it gotten better or worse with time?
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 2020
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