Curious about mixing interior and exterior paint?


Wondering if it’s feasible or a recipe for disaster?


This blog post delves into the dos and don’ts of mixing paints and blending these two types of paint.


Discover the factors to consider, potential pitfalls, and expert tips to achieve a successful outcome.


Whether you’re contemplating a DIY painting project indoors or seeking professional tips on mixing paint, this guide will provide clarity on blending interior and exterior paint effectively.

Interior vs Exterior Paint Differences

Chemical Composition


Interior and exterior paints differ in their chemical composition, primarily in the additives used.


Exterior paints contain additives that provide protection against UV rays and moisture, ensuring longevity.

Durability and Weather Resistance


Exterior paints are formulated to withstand harsh weather conditions, such as rain, snow, and UV exposure, while interior paints focus on washability and stain resistance.

Impact on Performance and Appearance


The differences in chemical composition result in exterior paints being more durable and resistant to fading compared to interior paints.


This means that using exterior paint indoors might lead to faster wear and less vibrant colors over time.

Potential Mixing Issues

Color Discrepancies


Mixing interior and exterior paints can lead to color discrepancies due to variations in ingredients.


Interior paints often contain volatile organic compounds, which differ from the resins used in exterior paints.


This difference can result in color inconsistencies when combined.

Finish Inconsistencies


When you try to mix interior and exterior paints, be wary of potential finish inconsistencies.


The way these two types of paint dry and cure differs, leading to uneven finishes on surfaces.


This can affect the overall aesthetic appeal of your project.

Adhesion and Longevity Impact


Mixing interior and exterior paints may impact the paint’s adhesion and longevity.


Temperature fluctuations, such as exposure to cool, rain, or even snow, can cause issues like cracking or peeling.


Using leftover mixed paint may alter its ability to withstand UV rays, reducing its durability over time.

Health and Safety Concerns

Proper Ventilation


Ensure proper ventilation when working with paint indoors to minimize exposure to harmful fumes.


Protective gear, such as masks and gloves, should be worn to prevent skin contact.


Paint fumes can lead to indoor air quality issues, causing respiratory problems and headaches.


To maintain a healthy environment, ventilate the area well during and after painting.

Health Hazards


Inhaling paint fumes can result in dizziness, nausea, or even more severe health issues.


It’s crucial to prioritize safety by avoiding prolonged exposure to these chemicals.


Certain paints contain toxic substances that can be harmful if absorbed through the skin.


Always read product labels carefully and follow safety instructions to prevent any health risks.

Safe Disposal


After mixing interior and exterior paints, it’s essential to dispose of any leftover paint properly.


Avoid pouring it down drains or into the soil as it can harm the environment.


To ensure safe disposal, mix the remaining paint with an absorbent material like cat litter to solidify it before throwing it away.


This helps prevent contamination of water sources and soil.

Expert Mixing Recommendations

Ideal Ratios


When mixing interior and exterior paints, it is crucial to follow the recommended ratios provided by manufacturers.


Typically, a 1:1 ratio for blending paints from different brands ensures optimal results.


This balanced approach helps maintain the integrity of the paint formula.

Compatibility Testing


Before combining interior and exterior paints, experts suggest conducting a compatibility test.


Apply a small amount of the mixed paint on a test surface to observe how well they adhere and dry together.


This simple step can prevent potential issues such as peeling or uneven finish.

Thorough Mixing Techniques


To achieve a uniform blend of interior and exterior paints, thorough mixing is essential.


Use a stir stick or electric mixer to ensure all components are well incorporated.


Inadequate mixing can lead to color discrepancies and inconsistent coverage, affecting the overall finish of the painted surface.

Top Paints for Mixing

Versatile Brands


  • Sherwin-Williams: Known for its quality, Sherwin-Williams offers a wide range of interior and exterior paints that blend seamlessly.


  • Behr: Behr’s paint lines are popular for their compatibility when mixing, making them ideal for creating custom colors.



  • Sherwin-Williams SuperPaint: This product is a favorite among DIY enthusiasts for its ease of mixing and excellent coverage.


  • Behr Marquee: With its rich pigments and smooth finish, Behr Marquee is perfect for achieving vibrant custom colors.




Sherwin-Williams and Behr paints are formulated with high-quality pigments that ensure vibrant colors when mixed.


These paints have excellent adhesion properties, making them suitable for both interior and exterior applications.


The matte finish of these paints adds a touch of elegance to any painting project.



In navigating the realm of mixing interior and exterior paint, one must tread cautiously, understanding the disparities between these two types to avoid compromising quality and durability.


While some situations may warrant their combination, health and safety should remain non-negotiable.


Expert recommendations and top paint choices can guide this delicate process, ensuring a successful outcome.


For those pondering the fusion of interior and exterior paints, meticulous consideration of the outlined factors is indispensable.


By adhering to expert advice and safety precautions, one can embark on this journey armed with knowledge and precision.


Remember, a well-informed decision today can yield a harmonious blend tomorrow.


For a professional painting job, consider hiring Blank Canvas Painting.


Our expertise ensures meticulous attention to detail and exceptional results, whether for interior or exterior surfaces.


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