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Flashing Paint Defect: What Causes Uneven Sheen and How to Prevent It
You’ve just painted your wall. The colour looks perfect in the tin, the first coat dries beautifully, and everything seems on track. But a day later, when sunlight hits the wall, something feels off. Certain patches look shinier than others. Some areas appear duller. Suddenly, the wall has a slightly patchy paint appearance that you can’t unsee.
This is a very common issue in home painting known as the flashing paint defect. While it may not affect the durability of the paint, it can certainly affect how smooth and uniform your walls look.
In this guide, we’ll break down what flashing is, the common causes of paint flashing, and practical ways homeowners can avoid or correct it.
What Is a Flashing Paint Defect?
A flashing paint defect occurs when certain areas of a painted wall reflect light differently from others. Even though the same paint was used everywhere, some sections appear glossier while others look flatter. This difference in light reflection is known as paint sheen variation.
Flashing usually appears only when light falls on the wall from the side, like natural daylight from a window or a ceiling light shining across the surface. Instead of looking smooth and uniform, the wall ends up with an uneven paint finish that feels slightly blotchy or inconsistent.
While it may look frustrating, flashing is usually linked to the painting process, not the paint itself.
The Most Common Causes of Paint Flashing
If you’re wondering what went wrong, you’re not alone. Many homeowners encounter flashing after repainting a room.
Here are some of the most common causes of paint flashing.
1. Patches or Repairs on the Wall
Walls often have small repaired areas, like filled cracks, nail holes, or sections treated with putty.
These spots tend to absorb paint differently from the rest of the wall. If they’re not properly primed, they can dry with a slightly different sheen, leading to visible paint sheen variation.
| Our Recommendation: To avoid an uneven paint finish, apply One Pro Smooth Primer on interior walls before painting. It helps create a uniform base, improves paint adhesion, and ensures the topcoat dries evenly across the entire surface. |
2. Uneven Paint Application
Painting might seem straightforward, but the way paint is applied matters a lot. If some sections get a thicker coat while others get a thinner layer, they may dry differently.
That’s when you start seeing an uneven paint finish.
3. Skipping Primer
Primer may not be the most exciting step in painting, but it’s one of the most important.
Without primer, different parts of the wall absorb paint at different rates, especially if the surface includes plaster, putty, or older paint layers. This uneven absorption often leads to a patchy paint appearance.
4. Small Touch-Ups After the Wall Has Dried
It’s tempting to fix a small spot with a quick touch-up once the paint dries. But these patches can sometimes stand out because they dry with a slightly different sheen.
Even if the colour matches perfectly, the surface reflection may not.
| Tip: Check the wall in daylight before wrapping up the job. Flashing is only visible when natural light hits the wall at an angle. Taking a quick look during the day can help you spot an uneven paint finish early. |
How to Prevent Flashing While Painting
The best way to deal with flashing is to prevent it in the first place. A few careful steps during the painting process can make all the difference.
1. Start With a Smooth, Even Surface
Good paint results begin with proper surface preparation. Sand repaired areas so they blend with the rest of the wall. A well-prepared base helps the paint spread and dry evenly.
Using reliable wall preparation products helps create a uniform surface that reduces uneven absorption.
2. Never Skip the Primer
Primer acts like a balancing layer for your wall. It seals porous areas, evens out the surface, and gives the paint a consistent base to adhere to.
This simple step goes a long way in preventing paint sheen variation and reducing the chances of a patchy paint appearance later.
3. Use Consistent Painting Strokes
Try to maintain even pressure when using a roller and avoid spreading paint too thin.
Professional painters often work section by section, ensuring the paint layer stays consistent across the wall. This helps avoid an uneven paint finish
| Tip: Maintain a “wet edge” while painting by slightly overlapping each new roller stroke with the previous one while the paint is still wet. This technique helps prevent visible lap marks and minimises variations in sheen, ensuring a smooth, consistent finish across the entire surface. |
4. Apply the Recommended Number of Coats
Many homeowners stop after one coat, especially if the colour looks good already. But for a truly smooth finish, two coats are usually essential. The second coat helps even out the paint layer and reduces the chances of a flashing paint defect.
| Our Recommendation: High-quality interior paints, such as Style Colour Smart, are designed to provide better coverage and more consistent finishes across surfaces. |
How to Fix Flashing Paint
If the flashing paint defect has already appeared, don’t worry, it can still be corrected.
Here’s how to fix flashing paint in a practical way.
Step 1: Lightly Sand the Surface
This helps reduce differences in sheen between glossy and dull areas.
Step 2: Apply a Primer
Primer evens out surface absorption and prepares the wall for repainting.
Step 3: Repaint the Entire Section
Instead of touching up one small spot, repaint the entire wall or section. This ensures a consistent finish and eliminates the patchy paint appearance.
| Tip: Avoid spot corrections whenever possible. Small touch-ups often stand out once the paint dries. Repainting the full wall section usually gives a much more even and professional-looking finish. |
A Smooth Wall Is All About the Process
A flashing paint defect can feel frustrating, especially after putting time and effort into painting your home. But in most cases, it simply comes down to preparation and application.
With proper surface preparation, a good primer, and consistent painting techniques, it’s much easier to avoid issues like uneven paint finish.
And when you pair the right process with thoughtfully designed painting solutions, like those from Birla Opus, you’re setting your walls up for a finish that looks just as good in sunlight as it does right after the paint dries.
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August 2023
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GRASIM INDUSTRIES LIMITED, Birla Paints division
9th floor, Birla Centurion, Century Mills Compound, Pandurang Budhkar Marg, Worli, Mumbai– 400030, Maharashtra, India.
Registered Office:
Birlagram, Nagda- 456 331 (M.P.) Tel: (07366) 246760-66, Fax: (07366) 244114, 246024, CIN: L17124MP1947PLC000410
Allwood Contractor App Helpdesk
Call: 1800 120 1234, Monday to Saturday, 09:30 am – 6:30 pm (Except Public Holidays).
Email: Opuscare@adityabirla.com
Product Warranty
Terms and Conditions for product warranty registration of Birla Opus products
The Warranty shall be effective from the date of purchase of the Product as per the tax invoice (“Warranty Start Date”), provided that painting work is fully complete, and the Consumer registers the Product for warranty.
The Product must be registered within 15 days from the date of purchase by calling customer care at 18001201234 or registering on www.birlaopus.com and furnishing purchase details as required during the Warranty registration.
The Warranty shall be valid for parameters and period as defined in the respective product warranty document (‘Warranty Period’) from the Warranty Start Date.
Upon settlement of any claim, Warranty of replaced Product will not start afresh, and will continue for the remainder of the Warranty Period from the Warranty Start Date.
If there is a break/ lag in completing the painting work, the registration of the Warranty and Warranty Start Date will be determined by the Company at its sole discretion.
The Company may appoint a person to examine and confirm the application of the Product as per the directions specified prior to registering the Warranty.
For registering of Warranty, where quantity of Product purchase is equal to or more than 200 litres, please call our Helpline on 1800 120 1234 with requisite details. The registration of Warranty in such cases is subject to a satisfactory pre‐inspection at site by Company’s representative.
- For the warranty to be applicable:
- Minimum volume of the product required to be purchased needs to be met
- Birla Opus recommended system needs to be used
- Product coverage and application guidelines need to be adhered
For more details, please refer to respective product specific warranty document and product information sheet.
Consumer may raise a claim within 30 days of discovering issue(s) noticed on the affected areas based on Warranty Parameters/ scope
The Consumer is required to notify the Company of the issue(s) noticed along with the invoice details, sample pictures and basis for Warranty invocation by contacting the customer care at 1800 120 1234. The Consumer shall provide such additional details as required by the Company and/or allow the Company to visit/inspect the painting site either in portion or entirety at the Company’s discretion.
In case where the Company decides that the Warranty is applicable on the issue(s) noticed on the affected areas, the Company shall bear the Replacements Costs as detailed in respective product warranty document to repair/ repaint the affected areas.
Replacement Costs shall mean the cost of material and labour required to correct the affected portions, as determined by the Company.
In case where the Company decides that Warranty is not applicable, the same shall be communicated to the Consumer.
Warranty is applicable only to the affected area where the Product is used in accordance with application guidelines and not to the rest of the areas.
In case the Consumer carries out repair works on the areas covered under the Warranty, the same shall be at their own risk and the Company’s Warranty on the Product shall not be valid on such repaired areas.
The Warranty will cover only manufacturing defects of the Product and will not cover any defects arising out of factors not in control of the Company. For more details of exclusions, please refer to the warranty document of respective product.
Except expressly stated, the Company disclaims any liabilities whether in contract, tort or otherwise. The Company makes no warranty regarding merchantability or fitness of products for any particular purpose.
The Company shall not be held liable towards loss or damages of incidental, indirect or consequential nature or for any value more than the tax invoice value.
In case of any disputes, exclusive jurisdiction of the courts of Mumbai shall apply. Governing laws shall be Laws of India.
The facts and all matters concerning any Warranty/ claim/ dispute will always be kept confidential by both the Consumer and the Company.