If you’re like me, you love the rich patina that comes with aging copper but don’t always love the greenish hue that can develop. While some appreciate that verdigris look, there are times when sealing bare copper makes sense – if you want to maintain the natural color longer, prevent tarnish and corrosion on high-traffic surfaces, or simply prefer a shinier look.
This blog post will walk through different options for how to seal copper and best practices for applying sealers to help keep your copper looking its best for longer through a simple sealing process. Whether you have copper pipes, roofing, gutters, or accessories like planters or artwork that you want to preserve, read on for everything you need to know to seal copper and prevent it from oxidizing over time.
9 Best Ways on How to Seal Copper
1. Clear Lacquer Spray:
Clear lacquer spray is one of the most popular options for sealing copper due to its ease of use and widespread availability. Simply spray a light coat of clear lacquer on clean, dry copper surfaces and let it dry completely before applying additional coats if desired. This will create a protective barrier against moisture, preventing tarnish and corrosion. If you prefer a matte finish, look for a satin or flat-clear lacquer spray.
2. Clear Enamel Paint:
Another popular option is clear enamel paint, which can also be sprayed or brushed on copper surfaces. Enamel paint provides a more durable seal compared to lacquer and is resistant to heat, chemicals, and UV light. This makes it a great choice for sealing copper pipes or outdoor accessories. If using enamel paint, be sure to apply multiple thin coats and let each coat dry completely before applying the next.
3. Carnauba Wax:
Carnauba wax is a natural option for sealing copper that creates a barrier against moisture and oxygen. It’s also heat-resistant and leaves a glossy finish when buffed out. To use carnauba wax, simply apply a small amount to a clean cloth and rub it onto the copper surface in a circular motion until it is evenly coated. Allow it to dry for 10-15 minutes before buffing with another clean, dry cloth.
4. Beeswax:
Similar to carnauba wax, beeswax is a natural option for sealing copper that creates a protective barrier and leaves a shiny finish when buffed out. It’s also heat-resistant and can be used on both indoor and outdoor copper surfaces. To use beeswax, follow the same steps as carnauba wax – apply a small amount to a clean cloth and rub it onto the copper surface in a circular motion, then let it dry before buffing.
5. Polyurethane Varnish:
Polyurethane varnish is another popular option for sealing copper due to its durability and resistance to heat, chemicals, and UV light. It can be brushed or sprayed onto copper surfaces and dried to a hard, glossy finish. However, it can be more difficult to apply evenly compared to wax or spray options. This is a good choice for larger surfaces like copper countertops or roofing. If applying multiple coats, be sure to sand lightly between each coat for a smoother finish.
6. Metal Sealer:
If you have copper jewelry or small accessories, metal sealers specifically designed for sealing copper are a great option. These sealers come in liquid form and can be brushed onto the surface before drying to create an invisible barrier that prevents tarnish and corrosion. They are also heat-resistant, making them a great choice for copper cookware or utensils.
7. Vinegar and Salt Solution:
For those looking for a DIY option, vinegar, and salt can be used to create a solution that will help seal copper surfaces and prevent oxidation over time. Simply mix equal parts white vinegar and table salt in a bowl until the salt is dissolved. Then, using a clean cloth or sponge, apply the solution to the copper surface and let it sit for 10-15 minutes before wiping it off and buffing it with a dry cloth. This method creates a natural patina on the copper while also sealing it from moisture.
8. Boiled Linseed Oil:
Boiled linseed oil is another natural option for sealing copper and is often used on outdoor copper surfaces like roofs or gutters. It creates a protective barrier against moisture and UV light while also enhancing the natural color of the copper. To use, clean the copper surface first, then apply a thin layer of boiled linseed oil with a clean cloth or brush. Let it sit for 15-20 minutes before wiping off the excess and buffing.
9. Epoxy Resin:
For a more permanent and heavy-duty seal, epoxy resin can be used on copper surfaces. This is often used for decorative items like sculptures or artwork, as it creates a strong and durable barrier against moisture and UV light while also enhancing the color and shine of the copper. However, this method requires careful application and may not be suitable for all types of copper.
Following these best practices and choosing the right sealer for your specific copper surface will help ensure a successful sealing process. With proper maintenance and periodic reapplication, you can enjoy the natural beauty of copper without worrying about tarnishing or corrosion.
Additional Tips and Tricks to Seal Copper
1. If you’re using a sealant that requires mixing, make sure to follow the instructions carefully. Different sealants require different ratios of components and following the correct ratio is crucial for an effective seal.
2. Before applying any sealant, clean the copper surface thoroughly with soap and water to remove any dirt or oils. This will help the sealant adhere better and ensure a more durable seal.
3. For added protection, consider applying a primer before sealing the copper surface. This will help the sealant adhere better and provide an extra layer of protection against moisture and corrosion.
4. If you’re working with larger areas or complex shapes, it might be necessary to use masking tape to protect surrounding surfaces from any accidental spillage or overspray.
5. If you’re sealing copper pipes, make sure to turn off the water supply and drain the pipe completely before applying any sealant. Any moisture or debris inside the pipe can prevent a proper seal from forming.
6. When working with high-temperature applications, such as sealing on a stove or fireplace, make sure to use a heat-resistant sealant specifically designed for these types of situations.
7. Be mindful of the type of sealant you’re using and its compatibility with different materials. Some sealants may be corrosive to certain metals or plastics, so always check the label before applying.
8. If you’re sealing outdoor copper surfaces, make sure to use a sealant that is specifically designed for outdoor use and can withstand exposure to UV rays and harsh weather conditions.
9. Properly dispose of any leftover sealant or empty containers according to the manufacturer’s instructions. Some sealants may require special disposal methods due to their chemical composition.
10. After sealing, allow the recommended drying and curing time before exposing the sealed copper surface to water or other elements. This will ensure a strong and long-lasting seal.
By following these additional tips and tricks, you can ensure a successful seal on your copper surfaces that will protect them from corrosion and maintain their beauty for years to come. So, keep these tips in mind and enjoy the benefits of sealed copper! Happy sealing!
Frequently Asked Questions
What is the Purpose of Sealing Copper?
The primary purpose of sealing copper is to prevent tarnishing and corrosion. Copper can easily react with oxygen, water, and other elements in its environment, causing it to change color or become discolored. Sealing copper surfaces creates a barrier between the metal and its surroundings, preventing these reactions from occurring. It also helps to maintain the appearance and longevity of copper surfaces.
What Are Some Common Methods for Sealing Copper?
There are several methods for sealing copper, including lacquering, waxing, and using sealants. Lacquer is a popular choice as it forms a strong protective layer over the metal. Waxing is another option that provides a natural-looking finish while protecting tarnishing. Sealants, such as clear coatings or corrosion inhibitors, are also commonly used to seal copper surfaces.
How Do I Prepare Copper Surfaces for Sealing?
Before sealing copper surfaces, it is crucial to prepare them properly. Start by cleaning the surface with a mild detergent and water to remove any dirt or grime. Next, use a metal cleaner or polish to rid the surface of any existing tarnish. Rinse the surface thoroughly and dry it completely before proceeding with the sealing process.
Can I Seal Copper While It is Still New?
Yes, you can seal copper while it is still new. It is recommended to do so as a preventive measure. Sealing new copper surfaces can help to protect them from tarnishing and corrosion, ensuring their longevity and maintaining their appearance.
How Often Should I Seal Copper Surfaces?
The frequency of sealing copper surfaces depends on various factors, such as the amount of exposure to air and moisture, the type of sealant used, and the level of wear and tear. In general, it is recommended to reseal copper surfaces every one to three years. However, if you notice any signs of tarnishing or corrosion, it is best to seal the surface immediately.
Conclusion
All in all, knowing how to seal copper is essential knowledge for anyone who owns copper items or works with the metal. Sealing copper surfaces not only helps to maintain their appearance but also prolongs their lifespan. By following proper cleaning and sealing techniques, you can ensure that your copper surfaces remain in pristine condition for years to come. So next time you have a piece of copper to seal, remember these helpful tips and techniques to keep it looking its best. Happy