Chloe Zhang
Chalk paint is a popular choice for painting furniture and other items due to its versatility, ease of use, and the beautiful flat matte finish it produces. It can be used on a variety of surfaces, including wood, concrete, metal, matt plastic, and ceramic. While some people choose to leave their chalk-painted surfaces bare, sealing chalk paint can provide protection and a desired aesthetic finish. There are several ways to seal chalk paint, including wax, glaze, oils, polyacrylic sprays or liquids, and clear spray topcoats. Each method has its pros and cons, and the best option depends on the desired look, durability, and the amount of work one is willing to put in.
Sealing Chalk Paint on Plastic
| Characteristics | Values |
|---|---|
| Wax | Used to seal chalk paint, leaves a soft, matte sheen and comes in a variety of colors |
| Clear Spray Topcoats | Can be used to protect a piece with lots of nooks and crannies, typically a version of polyurethane |
| Glaze | A liquid product applied and then wiped off to achieve an aged look, adds texture and aesthetic value |
| Polyurethane | A clear liquid oil-based topcoat, applied with a brush or sprayed on, provides a durable finish |
| Polycrylic | A water-based version of polyurethane |
| Oils | Popular choice for sealing chalk paint, works well on reviving old wood |
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What You'll Learn
Wax
Before waxing, ensure that your piece of furniture is thoroughly painted and dried. You can use a brush or a lint-free cloth to apply the wax. Work in large areas, sweeping the wax over the paint in loose circular motions, ensuring even coverage. You can also use a wax brush or a soft brush with stiff bristles to apply the wax. Apply a thin coat of wax, working in small sections at a time. Wipe off any excess wax with a lint-free cloth.
The wax will be touch-dry within a few hours but can take up to 2 weeks to fully cure and harden. You can use the furniture during this time, but with a little caution. If you desire a polished finish, you can leave the piece overnight and buff the wax the next day with a clean, lint-free cloth.
You can also apply a second coat of wax for extra durability. If you prefer a distressed look, you can apply a coat of dark wax after the clear wax has dried. Alternatively, you can sand down the paint before or after applying wax for a different effect.
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![Clear Finishing Wax – Protective Topcoat for Chalk Style Furniture Paint, Raw or Stained Wood, Odor-Free, 500ml [Jolie]](https://m.media-amazon.com/images/I/31zxwI7wLEL._AC_UL320_.jpg)
Polyurethane
When using polyurethane to seal chalk paint, it is important to note that it should be used only over paint and not over wax, as mixing wax and polyurethane can be dangerous and is a fire hazard. Chalk paint is water-based, so it is recommended to use water-based polyurethane. It is also important to work in a well-ventilated area or outdoors, as polyurethane has a strong odour. Additionally, some polyurethane products can turn white chalk paint yellow over time, so it is crucial to choose a product specifically designed for chalk paint, such as Rust-Oleum Matte Clear.
To apply polyurethane, start by lightly sanding the surface of the chalk paint. Then, apply thin coats of the sealant, allowing the surface to cure between each coat. This process may take some time, so it is important to check the curing time of the product you are using.
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Polycrylic
When applying polycrylic, it is important to ensure that the surface is clean and dry. Use a paintbrush to apply a thin coat of the sealant, moving in one direction and making sure to get into any small spaces. Allow the first coat to cure fully before applying a second coat. The curing time will vary depending on the brand, so always check the label. Polycrylic can also be applied with a roller, and it can be diluted with 10% water to help it go on more evenly.
It is important to note that polycrylic may not be suitable for all projects. While it provides a durable finish, it may not be as durable as polyurethane, which is a better option for outdoor furniture or areas prone to liquid spills. Additionally, polycrylic can sometimes pull tannins from the piece, causing staining. It is also important to work in a well-ventilated area when using polycrylic, as the fumes can be strong.
When choosing a polycrylic sealant, look for one that is specifically designed for chalk paint and that will provide the desired finish. Some popular options include Minwax Polycrylic in clear matte and Rust-Oleum Matte Clear. These products are designed to seal chalk paint without yellowing, which can be a common issue with other types of sealants.
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Glaze
Chalk paint is super porous, and anything that you put on it will soak into the paint. So, if you don't put a coat or two of poly over the chalk paint, the glaze will soak right into the paint, making it impossible to work with. You can apply poly over the glaze to set/seal it, or you can apply poly first and then apply the glaze for a bit more control and distribution of the glaze. After you are happy with the glaze, let it dry overnight. The next day, spray 3–4 more coats of poly onto the dresser, letting each coat dry completely. You can also sand the poly smooth in between coats to make it extra soft and smooth.
Sealing glazed furniture is key to keeping your project durable and long-lasting. Glaze is a thin layer that can easily be damaged or discoloured without proper protection. Sealing adds a protective barrier against daily wear and tear, including spills, scratches, and fingerprints.
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Oils
It is important to note that oil-based sealants can cause white chalk paint to turn yellow. This includes some water-based polys as well. If you want to avoid this, you can use a product like Rust-Oleum Matte Clear or Fusion Mineral Paint's "Stain and Finishing Oil".
Chalk paint is a versatile option for decorating indoors and outdoors, and it can be used on a variety of surfaces including wood, concrete, metal, matt plastic, and even ceramic. It is eco-friendly and contains very low volatile organic compounds (VOCs), resulting in virtually no smell.
If you are looking for a shabby chic or antiqued look, you may want to consider using wax or varnish instead of oil to seal your chalk paint. Wax sealant will give your surface a smooth, satiny finish and can be applied with a stiff paintbrush or a soft, lint-free cloth. Varnish, on the other hand, is a good option for frequently used pieces of furniture as it creates a robust surface and dries quickly.
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Frequently asked questions
There are several ways to seal chalk paint, including wax, glaze, oil, polycrylic, and polyurethane.
Furniture wax or paste is a semi-solid product that you can apply with a rag or round bristle brush and then buff out. It typically leaves a soft, matte sheen and comes in a variety of colours.
Polyurethane is a clear liquid oil-based topcoat that is typically the most durable finish and is best suited for high-traffic, water-prone objects. It can be applied with a brush or sprayed on.
Glaze is a liquid product that you apply and then wipe off the excess to achieve an aged look. It is not the most durable topcoat, but it can add a lot of texture and aesthetic value to your project.
