How to Seal Raku Pottery

Pottery has a history dating back thousands of years, with various methods and techniques used to create beautiful pieces of art. One particular style that stands out is Raku pottery, known for its unique colors and patterns. Originally developed in Japan during the 16th century, Raku pottery has gained popularity all over the world due to its organic and unpredictable nature.

Sealing Raku pottery is an essential step in the process of creating a finished piece. It not only enhances the visual appearance but also protects the porous surface of the clay. In this guide, we will discuss the various methods on how to seal raku pottery and give you tips on achieving the desired results.

Understanding Raku Pottery

Raku pottery is traditionally made from a low-fire type of clay that is porous and often rough in texture. These qualities make it ideal for the unique firing process that gives Raku pottery its distinctive appearance.

Before sealing, the surface of Raku pottery should be cleaned thoroughly to remove any dust or debris that may have accumulated during the firing process. This step is crucial as any impurities left on the surface may affect the outcome of the sealant.

11 Best Methods on How to Seal Raku Pottery

1. Use Wax Sealant:

Wax sealant is a popular choice for sealing Raku pottery as it provides a natural-looking finish and enhances the colors of the piece. It is also easy to apply and can be buffed to achieve different levels of shine. This method is best for decorative pieces that will not come into contact with water or food. If the piece is intended for practical use, a different sealant should be used.

2. Apply Shellac:

Shellac is another widely used sealant for Raku pottery, known for its durability and resistance to heat and moisture. It can be applied in a variety of ways, such as spraying, brushing, or dipping. However, it may add a yellow tint to the surface of the pottery, which may not be desirable for some pieces. Applying a layer of clear glaze beforehand can help prevent this.

3. Use Polyurethane Varnish:

Polyurethane varnish is a durable sealant that provides a glossy finish and protects the surface from scratches and water damage. It is easy to apply and dries quickly, making it an ideal choice for large or complex pieces. However, it can be toxic and requires proper ventilation when applied. Using a water-based polyurethane can reduce the toxicity level.

4. Apply Epoxy Resin:

Epoxy resin is a two-part sealant that provides an incredibly durable and glossy finish to Raku pottery. It is often used for functional pieces such as plates or bowls as it can withstand high temperatures and is food-safe once cured properly. However, it can be challenging to work with and requires precise measurements and mixing. While applying, it is essential to wear protective gear and work in a well-ventilated area.

5. Try Lacquer:

Lacquer is a versatile sealant that can be applied using different techniques to achieve various finishes. It can provide a high gloss finish or a matte look depending on the desired outcome. However, it is not as durable as other sealants and may require reapplication over time. This method is best for decorative pieces or those that will not be exposed to harsh conditions.

6. Use Acrylic Sealant:

Acrylic sealant is a popular choice for sealing Raku pottery due to its affordability and easy application. It provides a clear, glossy finish that can enhance the colors of the pottery. However, it may not be as durable as other sealants and may need to be reapplied regularly. It is best for decorative pieces that will not come into contact with water or heat. Using a sealant specifically designed for outdoor use can increase its durability.

7. Apply Oil-Based Sealant:

Oil-based sealants, such as linseed oil or tung oil, are commonly used to seal Raku pottery. They provide a natural-looking finish and enhance the colors of the piece. However, they may darken over time and require reapplication after prolonged exposure to sunlight. This method is best for decorative pieces that will not be exposed to water or extreme temperatures.

8. Use Silicone Sealant:

Silicone sealants, also known as caulking, are commonly used to seal the seams and cracks on Raku pottery. They can withstand high temperatures and provide a waterproof barrier, making them ideal for outdoor or functional pieces. However, they may not be suitable for decorative pieces as the finish can appear cloudy. Using a clear silicone sealant can help prevent this.

9. Apply Ceramic Sealer:

Ceramic sealers are specially designed to seal pottery and provide an excellent barrier against water and stains. They come in various forms, such as sprays, brushes, or dips, and can be used for both decorative and functional pieces. However, they may not be as durable as other sealants and may require reapplication over time. This method is best for pieces that will be used for practical purposes.

10. Use PVA Glue:

PVA glue, also known as white school glue, can be a budget-friendly option when sealing Raku pottery. It provides a clear finish and can withstand high temperatures once cured properly. However, it may not be as durable as other sealants and may require reapplication over time. This method is best for decorative pieces or those that will not be exposed to water.

11. Apply Waterproofing Spray:

Waterproofing sprays can provide a quick and easy solution for sealing Raku pottery. They are suitable for both indoor and outdoor use and can withstand high temperatures once cured properly. However, they may not provide a glossy finish and may require reapplication over time. It is best to choose a spray specifically designed for pottery or ceramic surfaces. This method is ideal for functional pieces or those that will be used outdoors.

Following these methods can help you achieve a beautiful and long-lasting seal on your Raku pottery. Each method has its unique benefits, and it is essential to consider the purpose of the piece before choosing a sealant. Remember to read the instructions carefully and take proper safety precautions when applying any sealant. With the right care, your Raku pottery will continue to shine for years to come. Happy potting! 

Additional Tips and Tricks to Seal Raku Pottery

1. If you want to add more texture to your Raku pottery, consider using sandpaper or a wire brush to create unique patterns and designs. This can be done before or after the final firing process.

2. Experiment with different glazes and combinations of glazes to achieve desired effects. Some potters even use horsehair or feathers on their pottery during the firing process for a one-of-a-kind finish.

3. It’s important to always wear protective gear, such as a respirator and gloves when working with Raku pottery due to the potential for inhalation of harmful materials. Safety should always be a top priority.

4. When firing your Raku pottery, make sure to have a fire extinguisher nearby and never leave the kiln unattended. The process can be unpredictable and it’s better to be safe than sorry.

5. Don’t be afraid to experiment with different techniques and methods when creating Raku pottery. This art form is all about embracing the unexpected and allowing for happy accidents.

6. Consider taking a Raku pottery class or workshop to learn from experienced artists and gain new insights into this unique form of pottery making.

7. Don’t get discouraged if your first few attempts at Raku pottery don’t turn out perfectly. Like any art form, it takes practice and patience to master.

8. If you’re looking to incorporate Raku pottery into your home decor, consider displaying it in a prominent place where it can be admired and appreciated by all.

9. Remember that Raku pottery is not just about the final product, but also the process and experience of creating it. Enjoy the journey and embrace the imperfections that make each piece truly unique.

Following these tips and tricks will not only help you create stunning Raku pottery but also enhance your overall experience with this beautiful and ancient art form. Keep experimenting, learning, and creating to continuously improve your skills and discover new techniques. And most importantly, have fun!

Raku pottery is a fascinating and rewarding craft that allows for endless possibilities and creative expression.  So go ahead and give it a try, you never know what beautiful piece of art you might create. Happy potting! 

Things You Should Consider to Seal Raku Pottery

1. Type of Sealant:

When it comes to sealing your Raku pottery, there are a few things you should consider before making your final decision. The first and most important thing is the type of sealant you will use. There are several options available, such as clear glaze, wax, or sealer sprays.

The clear glaze provides a shiny finish and can be used on both low and high-temperature Raku firings. However, it is not always suitable for functional pieces as it may contain lead or other toxic substances.

Wax, on the other hand, provides a more matte finish and can be used on both functional and decorative pieces. It is important to note that wax should only be used on low-temperature Raku pottery as it will melt at higher temperatures.

Sealer sprays are another option, which provides a clear and glossy finish. They are easy to apply and can be used on both low and high-temperature firings. However, make sure to check the ingredients of the sealer spray before using it on functional pieces.

2. Application Method:

Once you have chosen the type of sealant, the next thing to consider is the application method. The most common methods include brushing, dipping, and spraying.

Brushing allows for more control over where the sealant is applied and can be a good option for detailed pieces. Dipping is faster and more efficient, but it may not provide even coverage on larger pieces. Spraying is the quickest method and can provide an even coverage, but it may require more skill to achieve a consistent finish.

3. Pottery Surface:

Before applying any sealant, it is important to consider the surface of your pottery. If your piece has intricate details or textures, you may want to avoid a glossy finish as it can hide these features.

On the other hand, a glossy finish can enhance the colors and textures of smoother surfaces. Consider experimenting with different types of sealants and finishes to find what works best for your specific pieces.

4. Temperature Tolerance:

Different sealants have different temperature tolerances, so it is important to consider this before making your final decision. Some may not hold up well in extreme temperatures, leading to cracking or flaking.

Others may be more durable and can withstand high temperatures, making them suitable for functional pieces that will be used for cooking or holding hot liquids.

5. Long-Term Durability:

Last but not least, consider the long-term durability of your sealant choice. Some may provide a beautiful finish initially but may not hold up well over time. Others may be more durable and provide a longer-lasting seal. Consider the intended use of your pottery and choose a sealant that will hold up to everyday wear and tear.

By considering all these factors, you can make an informed decision on how to seal your Raku pottery to ensure its longevity and beauty. Experiment with different options and techniques to find what works best for your unique pieces. With proper sealing, your Raku pottery will not only be visually stunning but also functional and long-lasting. Happy potting! 

Precautions Need to Be Followed for Sealing Raku Pottery

First and foremost, make sure that your hands are completely dry before handling the pottery. Any moisture on your fingers can easily transfer onto the pottery and affect the sealant.

• Wear gloves to avoid direct contact with the sealant and to prevent any oil or dirt from getting onto the pottery.
• Use a brush or sponge applicator to evenly apply the sealant over the surface of the pottery. This will help to avoid any uneven or patchy coverage.
• Take extra care when sealing intricate designs or patterns on the pottery. Use a smaller brush for more precision and be sure to cover all areas thoroughly.
• Allow the sealant to dry completely before handling the pottery again. This can take anywhere from 24-48 hours depending on the type of sealant used.
• If possible, keep the pottery in a cool and dry place while the sealant is drying to minimize any potential damage or interference.
• Avoid exposing the sealed pottery to extreme temperature fluctuations or high humidity levels, as this can cause cracking or peeling of the sealant over time.
• When displaying your Raku pottery, avoid placing it in direct sunlight or near sources of heat, as this can also cause damage to the sealant.

Following these precautions will help to ensure that your Raku pottery stays sealed and protected for years to come. Remember to also regularly clean and dust your pottery to maintain its beauty and longevity. With proper care, your Raku pottery will continue to be a stunning addition to your home or collection.

Frequently Asked Questions

What is the Process for Creating Raku Pottery?

The process of creating Raku pottery involves shaping clay into desired forms, drying them thoroughly, and then firing them in a kiln. After the initial firing, pieces are removed from the kiln while still hot and placed in combustible materials such as sawdust or straw to create a reduction atmosphere.

This process causes the glaze to crack and creates unique patterns on the surface. After cooling, pieces are cleaned and polished to reveal their final appearance.

How Do You Seal Raku Pottery?

Sealing Raku pottery is an important step in the creation process as it helps protect the piece and enhance its appearance. The most common method of sealing Raku pottery is applying a combination of wax and oil to the surface.

This mixture not only adds shine but also helps seal any cracks or gaps in the glaze, making the piece more durable. Another method is sealer. This option is quicker and easier but may not provide as much protection as the wax and oil mixture.

Can I Use Raku Pieces for Functional Purposes?

While Raku pottery is primarily used for decorative purposes, it can also be used for functional purposes such as holding small items or serving food. However, due to the unpredictable nature of the reduction process, it is not recommended to use Raku pieces for activities that involve heat or water.

The glaze may not hold up well under these conditions and can affect the appearance of the piece.

How Do I Care for Raku Pottery?

To properly care for Raku pottery, avoid exposing it to extreme temperatures or water. Avoid using harsh chemicals or abrasive materials when cleaning as they can damage the glaze. It is best to use a soft cloth or brush to gently wipe down the surface. If displaying your Raku pieces outdoors, be sure to bring them inside during harsh weather conditions to prevent any potential damage.

Conclusion

All in all, knowing how to seal raku pottery is a crucial step in the creation process. It not only helps protect and preserve the piece but also enhances its appearance. Whether you choose to use a wax and oil mixture or a clear acrylic spray sealer, proper sealing will ensure that your Raku pottery can be enjoyed for years to come.

Remember to handle and care for your pieces with caution, avoiding extreme temperatures and harsh chemicals. With proper care, your Raku pottery can be a beautiful addition to your home or collection.  So go ahead and create some unique and stunning Raku pieces with the knowledge of how to seal them properly! Happy potting!

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