How to Make Interior Paint Into Exterior Paint

Interior paint and exterior paint are formulated differently to cater to their respective environments.

Interior paint is designed to provide durability and aesthetics inside your home, while exterior paint is engineered to withstand harsh weather conditions, UV radiation, and moisture.

Although it is not ideal to use interior paint for exterior surfaces, certain measures can be taken to make it more suitable.

Understanding the Difference Between Interior and Exterior Paint

Interior paint is formulated to resist stains, scuffs, and cleaning agents.

It also focuses on providing a smooth finish and excellent color coverage.

On the other hand, exterior paint is manufactured to withstand extreme temperatures, moisture, fading due to UV exposure, and other environmental factors.

It has additional additives that enhance durability, weather resistance, and protection against mildew and fungal growth.

Factors to Consider Before Converting Interior Paint into Exterior Paint

Before converting interior paint for use on exterior surfaces, several crucial factors need to be considered.

Durability

Exterior surfaces are exposed to various elements, such as rain, sunlight, temperature fluctuations, and wind.

The paint used on these surfaces must be able to withstand these conditions without deteriorating.

Interior paint may not possess the same level of durability as exterior paint, making it less suitable for long-term use outdoors.

Weather Resistance

Exterior paint is designed to resist moisture, prevent water infiltration, and withstand the effects of rain, snow, and humidity.

Interior paint, however, may not have the same level of weather resistance, making it vulnerable to damage when used outdoors.

UV Protection

Exterior paint includes UV-resistant additives that protect against color fading and damage caused by the sun's ultraviolet rays.

Interior paint usually lacks these additives, making it more susceptible to fading and discoloration when exposed to sunlight.

Steps to Convert Interior Paint into Exterior Paint

If you still decide to use interior paint for an exterior surface, the following steps can help make it more suitable:

Surface Preparation

Thoroughly clean the surface to remove any dirt, grease, or loose paint. Use a mild detergent and water, and rinse the surface thoroughly. Allow it to dry completely before proceeding.

Priming the Surface

Apply a high-quality exterior primer to the surface. The primer creates a suitable base for the interior paint and improves adhesion.

Make sure to choose a primer specifically designed for exterior use.

Applying Exterior Paint

Once the primer is dry, apply the interior paint in thin, even coats. Avoid heavy applications, as they may affect the paint's ability to adhere properly.

Allow each coat to dry completely before applying the next one.

Limitations and Risks of Using Interior Paint for Exterior Surfaces

It's essential to be aware of the limitations and risks associated with using interior paint for exterior surfaces:

• Interior paint may not provide adequate protection against weather conditions, leading to premature paint failure.

• UV exposure can cause interior paint to fade, discolor, or degrade faster when used outdoors.

• Interior paint may not adhere well to exterior surfaces, leading to poor adhesion and peeling.

It is highly recommended to use the appropriate exterior paint for outdoor surfaces to ensure long-lasting results and optimal protection.

Conclusion

While it is possible to convert interior paint into exterior paint by following specific steps, it is not the recommended approach.

Interior paint lacks the necessary durability, weather resistance, and UV protection required for exterior surfaces.

It is always best to use paint specifically formulated for outdoor use to ensure optimal performance and longevity.