Can You Mix Interior And Exterior Paint?
Decorating and renovating your home often means painting walls, trim, cabinets, doors – you name it. And when you embark on a big paint project, an important question arises: can you mix interior and exterior paint?
If you’re short on time, here’s a quick answer to your question: In general, it’s not recommended to mix interior and exterior paint. The formulations are different to suit their intended functions. But you may be able to mix them in certain scenarios if the sheens are the same.
Read on to learn more!
In this comprehensive guide, we’ll cover everything you need to know about mixing interior and exterior paint. We’ll discuss the differences between interior and exterior paint formulations, when it is and isn’t okay to mix them, and tips from the pros for how to mix paint properly.
The Main Differences Between Interior and Exterior Paint Formulas
When it comes to painting your home, it’s important to choose the right type of paint for each specific area. While it may be tempting to use the same paint for both interior and exterior surfaces, there are some key differences between the two formulas that make them suitable for their respective purposes.
Pigments and Binders
The pigments and binders used in interior and exterior paints vary significantly. Interior paints are typically formulated with pigments that provide vibrant and rich colors, as well as binders that offer excellent adhesion to indoor surfaces.
On the other hand, exterior paints contain pigments and binders that are specifically designed to withstand harsh weather conditions, including UV rays and moisture.
Sheens
The sheen or gloss level of interior and exterior paints also differs. Interior paints are available in a variety of sheens, including flat, eggshell, satin, semi-gloss, and high-gloss. These sheens are chosen based on the desired aesthetic and the practicality of the area being painted.
Exterior paints, on the other hand, are typically formulated with lower sheens to minimize glare and provide better durability against the elements.
Hiding Ability
Interior paints are often formulated to provide excellent hiding ability, allowing for better coverage over previous paint colors or imperfections on the walls. Exterior paints, however, are designed to offer superior hiding ability to effectively cover any surface flaws and provide a uniform and attractive finish.
Mildew Resistance
Exterior paints are specially formulated with additives that make them more resistant to mildew growth. This is essential for protecting the exterior surfaces of your home from the effects of moisture and humidity, which can lead to mold and mildew formation.
Interior paints, on the other hand, do not typically require the same level of mildew resistance.
Flexibility
Another important difference between interior and exterior paints is their flexibility. Exterior paints need to be able to expand and contract with temperature fluctuations, as well as withstand the impact of wind and rain.
Interior paints do not require the same level of flexibility, as they are not subjected to the same environmental stresses.
Overall, it’s important to use the appropriate paint formula for each specific area of your home to ensure longevity and optimal performance. Mixing interior and exterior paints may result in subpar results and a lack of durability.
It’s best to consult with a professional or a knowledgeable paint supplier to determine the right type of paint for your project.
When Can You Mix Interior and Exterior Paint?
Painting projects often require different types of paint, depending on whether it is for the interior or exterior of a building. However, there may be instances where you can mix interior and exterior paint to achieve the desired results.
It is important to consider a few factors before deciding to mix these two types of paint.
Matching Sheens
One situation where you can mix interior and exterior paint is when you need to match the sheen of a particular color. Sheen refers to the level of glossiness or shine in a paint finish. If you have a specific color in mind and can’t find it in both interior and exterior paint options, you can try mixing them to achieve the desired sheen.
However, it is crucial to ensure that the interior and exterior paints have similar properties and are compatible with each other. It is recommended to consult with a professional or refer to the paint manufacturer’s guidelines before attempting to mix different types of paint.
Darker Colors
Another scenario where you can consider mixing interior and exterior paint is when you want to achieve a darker color shade. Mixing different paint colors is a common practice to create custom shades. If you have a specific dark color in mind and can’t find it in both interior and exterior paint options, you can experiment by mixing them in small quantities.
It is important to note that the ratio of paint colors can significantly impact the final shade. It is advisable to start with small amounts and test the color on a small patch before applying it to the entire surface.
Small Amounts for Touch-Ups
Mixing interior and exterior paint can also be useful for small touch-up projects. If you have leftover interior and exterior paint of the same color, you can mix them to create a small amount for touch-ups. This can help maintain a consistent appearance without the need to purchase additional paint.
However, it is essential to ensure that the mixed paint is properly stored to prevent it from drying out or becoming unusable. It is recommended to store the paint in airtight containers and label them clearly for future use.
Remember, it is always best to consult with a professional or refer to the paint manufacturer’s guidelines before attempting to mix different types of paint. They can provide valuable advice and ensure that the mixed paint will adhere properly and provide the desired results.
Tips for Mixing Interior and Exterior Paint
When it comes to painting, many people wonder if they can mix interior and exterior paint. While it is possible to do so, there are a few important tips to keep in mind to ensure the best results. Mixing interior and exterior paint can be a cost-effective solution, especially if you have leftover paint from previous projects.
Here are some tips to help you successfully mix interior and exterior paint:
Always Mix in a Separate Container
One of the most important tips for mixing interior and exterior paint is to always mix the paints in a separate container. This will help you achieve a consistent color and texture throughout your project.
Mixing the paints directly on the wall or in the paint can may result in uneven color and texture, which can be difficult to correct.
Start with a Small Test Batch
Before mixing large quantities of paint, it’s always a good idea to start with a small test batch. This will allow you to see how the colors blend together and make any necessary adjustments before committing to a larger project.
It’s also a great way to experiment with different color combinations and create a unique look for your space.
Stir Thoroughly
When mixing interior and exterior paint, it’s important to stir the paints thoroughly. This will help ensure that the pigments are evenly distributed and that the colors blend together seamlessly. Use a stir stick or a paint mixer attachment for a drill to achieve the best results.
Remember to scrape the sides and bottom of the container to incorporate any settled pigments.
Watch Out for Changes in Sheen
When mixing interior and exterior paint, it’s important to watch out for changes in sheen. Interior and exterior paints often have different sheen levels, such as flat, eggshell, satin, or semi-gloss. Mixing paints with different sheens can result in an uneven finish, so it’s best to stick to paints with similar sheens for a consistent look.
If you’re unsure about the sheen, consult the manufacturer’s instructions or visit their website for more information.
Mixing interior and exterior paint can be a great way to save money and use up leftover paint. By following these tips, you can achieve a professional-looking finish and create a cohesive look in your space.
Remember to always mix the paints in a separate container, start with a small test batch, stir thoroughly, and watch out for changes in sheen. Happy painting!
Signs Your Paint Mixture Has Gone Wrong
Clumping or Separation
One of the first signs that your paint mixture has gone wrong is clumping or separation. When you mix interior and exterior paint, the different properties of each type of paint can cause them to react in unpredictable ways.
This can lead to clumps forming in the mixture, making it difficult to apply smoothly onto the surface. If you notice clumping or separation in your paint, it’s best to stop using it and start fresh with a new batch.
Flaking or Peeling
Another sign that your paint mixture has gone wrong is when it starts to flake or peel off the surface. This can happen when the different types of paint used in the mixture have incompatible bonding properties.
As a result, the paint may not adhere properly to the surface, leading to flaking or peeling over time. If you notice this happening, it’s important to remove the affected paint and repaint the surface using a properly mixed batch of paint.
Fading
If your paint mixture is not properly balanced, it can result in fading over time. This is especially true when mixing interior and exterior paint, as the exterior paint is designed to withstand harsh weather conditions and UV exposure.
When mixed with interior paint, which is not formulated to handle these elements, the color pigments can break down and fade faster. To avoid this, it’s best to use paint specifically designed for the area you are painting.
Mildew Growth
When interior and exterior paint are mixed incorrectly, it can create an environment that is conducive to mildew growth. This is because the different types of paint may have different levels of moisture resistance.
When moisture gets trapped between the layers of paint, it can create a breeding ground for mildew and mold. To prevent this, it’s important to ensure that the paint you use is suitable for the specific area and conditions it will be exposed to.
Remember, mixing interior and exterior paint can lead to unpredictable results. It’s always best to stick to using the appropriate type of paint for each specific area to ensure the best possible outcome.
If you need further guidance, consult with a professional painter or refer to reputable sources such as Bob Vila or Hunker for more information.
Conclusion
When tackling a big paint job, it’s tempting to try and stretch your existing cans of paint a bit further by mixing interior and exterior finishes. But the different formulations mean this isn’t always possible or advisable. For best results, stick to one formulation for large area painting.
However, for small touch-ups or when carefully following the tips above, you may be able to successfully mix interior and exterior paint.
By understanding the differences between interior and exterior paint, choosing compatible sheens, and taking precautions when mixing, you can make your paint go further without compromising quality. But if in doubt, consult the paint can labels or chat with a professional at your local paint store.
