| Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise


Download our free e-book! Overcoating bridges and other structures.

Problem Solving Forum
When can you coat new concrete

From JPCL, January 2011

More items for Coating Application

(Login to read the full article)


Comment from Martin Emore, (2/4/2011, 9:57 AM)

concrete is cured fully by twentyeight days. i think after this date one can apply the first coat of paint on top.

Comment from parviz mohamadi, (2/10/2011, 2:44 PM)

Surface preparation and conditions for painting of concrete surfaces can be found in SSPC-SP13 or NACE No. 6. That's right: All new concretes can be coated after 28 days, but the humidity of concrete and also soundness must be considered.

Comment from Jack Henley, (2/14/2011, 11:59 AM)

To my knowledge, there is no one rule that applies to all concrete, the 28-day rule. That rule applies to destructive testing, the 28-day break. Beyond this, you will require a vast amount of information, plus a very good product and a notable procedure.

Comment from Robert Cox, (2/14/2011, 8:08 PM)

The 28 days is a standard for strength of concrete. Normally, design of concrete is based on a mixture of sand, rock, cement and admixtures necessary to support structure. Chosen admixtures can cause slower or faster drying time, ie, gain in strength to support structure. Coating concrete: 1. Read the mfr's instructions on the paint container. 2. Call testing laboratory to make field tests of moisture (still) in the concrete. 3. When the moisture and other requirements of the manufacturer for application have been achieved, then it's ready for paint. Note: If it is a large job, call the manufacturer to visit the project. Get the manufacturer involved. Get him to tell you that it's ready to paint.

Comment from Bill Patterson, (2/14/2011, 10:53 PM)

Theoretically, concrete is never "completely" cured or hydrated. Curing continues at an exponentially decaying rate indefinitely. As noted in other posts, the 28 days was chosen to provide a standard time for specifications and testing, since without a standardized cure time, the strength is a moving target. None of that helps answer the question as to when coatings can be applied, to which Robert Cox's answer is right on. Get technical expertise from the manufacturer. Not only does concrete vary in its properties, but coatings vary in theirs.

Comment from Robert Cox, (2/15/2011, 12:59 AM)

And another thing... Concrete form release agents remaining on the concrete surface may not be compatible with the chosen paint. When you are finishing architectural concrete, get the paint manufacturer out on the job to look at residue on concrete surfaces. Robert Cox

Comment from Glenn Summers, (2/16/2011, 7:54 AM)

Bill Patterson and other comments go to the root of the question. We want to maintain moisture in the matrix to allow for complete hydration. And yes, as Robert Cox says, any relaease or curing/evaporation retarders must be removed prior to a coating application. For years, we have been applying a penetrating concrete sealer that does not form a film or membrane on a surface. Application is made as soon as the heat of hydration is lost, promoting a slow internal cure [keeping the moisture inside] that deters shrinkage, creep and crazing. After this application, a paint/coating may be applied after 48 hours without fear of moisture or internal chemistry migrating out to a surface. This same surface will also accept any coating at some future date without sand blasting, grinding or acid etching as a surface prep step prior to coating. Once the new pour has been stabilized, it resists carbonation and contamination into the matrix. After 48 hours, the contractor controls when the concrete is coated! Compatibility and adhesion testing by various manufacturers demonstrates excellent test results and spread rates on treated concrete. Low VOC content allows for fast tracking and interiors being finished in record time.

Comment from david cuthbertson, (3/2/2011, 7:30 PM)

I agree that SSPC and NACE have more than adequate standards for concrete coating and linings, but also too would recommend that applicators adhere to Product TDS wherever practical. Some products are Moisture Tolerant and therefore have a slightly higher acceptance to contained moisture. In the end, it is up to the applicator to satisfy that all Process Controls are put into place, and strictly followed. Unlike Carbon Steel, all concretes are generally different in composition and should be approached with care.

Comment Join the Conversation:

Sign in to our community to add your comments.

Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.

NACE International, The Corrosion Society
Toss Out Your Paper-Based Training!

Discover a new, interactive way of learning with the first module, Safety Codes, Practices, and Standards, of NACE’s Industrial Coating Application eCourse.

SAFE Systems, Inc.
Portable Blast &
Recovery Equipment

Trailer or skid mounted blast and recovery equipment. Systems designed for maximum versatility, environmental compliance
and overall cost savings.
Call 1-800-634-7278

Sika® Industrial Floor Coatings

Click to learn about floor and wall systems relied upon for performance, durability, easy maintenance and aesthetics across the every industry and environment.

Carlisle Fluid Technologies
Built for Tough Jobs

From Epoxies to Urethanes to other high solid coatings, the new Binks Airless 75 delivers a great finish using an ergonomic design. Visit for more information.

SABRE Autonomous Solutions
Safety, Productivity, Quality. Robotic Blasting

Learn how this simple to use, field deployed, automatic robot is eliminating hazards in major confined, cluttered and complex surface preparation projects.

DeHumidification Technologies

DH Tech has the most innovative and reliable equipment available to
control humidity efficiently
and effectively.

International WorkBoat Show

Corrosion Probe, Inc.
From Detection to Correction

Corrosion Probe, Inc. has the Most Concrete Coatings Experience and Expertise. Contact us today at

Montipower, Inc.
The MBX Bristle Blaster

Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit or call 877 629-8777

Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker

EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us

© Copyright 2000-2016, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail