How to Save Paint and Polyurethane from Rusty Cans: A Step-by-Step Guide

Ever find yourself staring at a paint can, almost completely full of perfectly good paint or polyurethane, only to discover it’s covered in rust? It’s a frustrating situation, isn’t it? The temptation to simply toss it and buy a new one can be strong, especially if the can were nearly empty. But what if it’s almost full? Wasting that much material feels like a crime. Last week, I faced this very dilemma, and I decided to take action. Here’s my comprehensive guide on how to salvage your valuable paint or polyurethane from a rusty can, saving you money and reducing waste.

The problem with rusty paint cans isn’t just aesthetic. Rust flakes can contaminate the paint, affecting its application and finish. Moreover, a severely rusted can might leak, leading to a messy and potentially hazardous situation. Therefore, transferring the paint to a clean, rust-free container is essential to preserve its quality and usability.

The Process: Rescuing Your Paint

This method is straightforward and requires minimal tools. You’ll need a new, clean paint can (available at any hardware store), painter’s tape, and potentially a strainer (like an old nylon stocking or cotton cloth) if you notice rust flakes in the paint.

1. Prepare the Rusty Can: Before you start, inspect the rusty can carefully. If the rust is extensive and the can is structurally compromised, proceed with extra caution. Wear gloves to protect your hands from rust and sharp edges.
2. Protect the Rim: One of the first areas to rust is the rim of the paint can. To prevent further contamination during the transfer process, apply painter’s tape to the inside of the rim. This creates a barrier between the rusty metal and the paint as you pour. Press the tape firmly to ensure it adheres well and provides a good seal.



3. Pour into a New Can: Carefully pour the paint or polyurethane from the rusty can into the new, clean can. Pour slowly and steadily to minimize spills and prevent rust flakes from entering the new container. Pay close attention to the paint as it flows, looking for any signs of contamination.



4. Strain (If Necessary): If you notice rust flakes in the paint, use a strainer to filter them out. Stretch an old nylon stocking or a piece of cotton cloth over the opening of the new can and secure it with a rubber band or tape. Pour the paint through the strainer, which will trap the rust particles while allowing the clean paint to pass through. This step ensures that the paint you transfer is free from contaminants that could affect its finish.

Preventing Future Rust: Proactive Measures

Now that you’ve successfully rescued your paint, let’s talk about preventing future rust issues. Proper storage and a few simple tricks can significantly extend the life of your paint cans.

Tips for Rust Prevention

• Seal the Lid Tightly: After each use, ensure the lid is securely sealed to prevent air and moisture from entering the can. Use a rubber mallet to tap the lid firmly into place.
• Store in a Cool, Dry Place: Store paint cans in a cool, dry environment away from direct sunlight and extreme temperatures. Fluctuations in temperature and humidity can accelerate rust formation.
• Invert the Can: After sealing the lid, invert the can for a few minutes. This creates an airtight seal by allowing the paint to fill the space between the lid and the rim, preventing air from entering.
• Use Painter’s Tape on the Rim: To further protect the rim from rusting, apply painter’s tape to the rim of the can after each use. This creates a barrier against moisture and helps prevent rust from forming. When you draw your brush across the rim to remove excess paint, you’re also dragging it across the tape, further protecting the metal.



• Consider Plastic Cans: For long-term storage, consider transferring your paint to a plastic can specifically designed for paint storage. These cans are rust-proof and offer a more durable storage solution.
• Regular Inspection: Periodically check your paint cans for signs of rust. Early detection allows you to take preventative measures before the rust becomes a serious problem.

Why Bother? The Benefits of Salvaging Paint

Saving paint from rusty cans isn’t just about saving money; it’s also about being environmentally responsible. Disposing of paint improperly can be harmful to the environment. By salvaging the paint and preventing rust, you’re reducing waste and contributing to a more sustainable approach to home improvement.

Furthermore, certain paints, especially specialty finishes or custom colors, can be expensive to replace. Salvaging these paints from rusty cans ensures that you don’t have to incur the cost of purchasing them again. It also avoids the frustration of trying to match a color that may no longer be available.

Finally, this process allows you to maintain a well-stocked paint supply for touch-ups and future projects. Having a variety of paints on hand can save you time and money in the long run, as you won’t have to make frequent trips to the hardware store.

Conclusion: Don’t Let Rust Win!

Rusty paint cans are a common nuisance, but they don’t have to spell the end for your perfectly good paint or polyurethane. By following these simple steps, you can salvage your materials, prevent future rust issues, and save money in the process. So, the next time you encounter a rusty paint can, don’t despair! Take action, rescue your paint, and enjoy the satisfaction of knowing you’ve saved valuable resources and contributed to a more sustainable approach to home improvement. Remember, a little preventative maintenance goes a long way in protecting your investments and ensuring that your paint supplies remain in top condition for years to come. Keep those cans rust-free and happy painting!