When it comes to painting glass surfaces, much consideration goes into the type of paint to be used. This is because glass surfaces are slick.
Glass is also not textured, it has no fibers, or grain for the paint to bite into. So paint adhesion is usually tough on glass surfaces but since chalk paint adheres to virtually any surface, can you use chalk paint on glass? Here is the answer to that.
Chalk paint can be used to paint glass surfaces. Chalk paint adheres to just about any surface including glass. However, the glass surface has to be cleaned with rubbing alcohol or a degreaser to remove stains before applying the chalk. It’s also advised to use chalk paint designed for glass surfaces.
But that’s not all. There is more to know about using chalk on glass and this post digs right into the topic.
So let’s dive in.
Will Chalk Paint Adhere To Glass?
Chalk paint will adhere or stick to glass surfaces as long as the glass surface is squeaky clean. Chalk paint is a water-based paint that adheres well to just about any surface. As long as the glass surface is free from grease, dirt, and grime, chalk paint will stick to it just fine.
However, when it comes to painting glass with chalk, it’s best to go for chalk paint designed for glass surfaces. This is because chalk paints designed for use on the glass will adhere perfectly to the slick glass surface.
To make the chalk paint last longer on glass, painters usually advise baking the paint by exposing it to a strong heat source like the oven.
Baking chalk paint on glass will make the chalk paint stick well and adhere to the glass for a very long time.
One of the main reasons chalk paint sticks to glass surfaces is the paint’s base. Chalk paints are water-based paints and like most other water-based paints, chalk will stick to just about any surface.
Oil-based paints on the other hand will have a hard time adhering to glass. This is because of the presence of natural and synthetic oils used in the paint’s makeup.
For chalk paints, there isn’t any natural or synthetic oil which means the paint will also dry quickly on glass. But sometimes, chalk paint doesn’t stick or adhere to glass. Why is that? Let’s find out.
Related Read: Can You Use Chalk Paint on Plastic?
Why Is Chalk Not Sticking To Glass?
The reason chalk paint isn’t sticking to glass is that the glass surface is dirty or has a previous coating that is repelling the chalk paint.
Also, chalk paint will not adhere to glass if the paint was applied in a cold environment. For chalk paint to stick and dry properly, the paint has to be applied at room temperature between 50 degrees and 85 degrees Fahrenheit.
When the glass surface is affected by dust or grease, it will stop the chalk paint from sticking well to the glass surface.
This is because the stains on the glass will repel the chalk paint when it is applied. If the glass is filthy, then you are applying the chalk paint on the filth and not the glass. So the chalk wouldn’t stick.
Also, chalk paint wouldn’t stick to the glass if you paint in a cold or moist room. Chalk paint like other latex paints has to be applied at room temperature between 50 and 85 degrees Fahrenheit.
If the temperature is constantly below 50 degrees, then the chalk will peel off because the cold wouldn’t let the chalk paint cure. There will also be moisture trapped in the chalk finish.
Also, if the room temperature is above 85 degrees Fahrenheit, then the chalk will dry too quickly. This will eventually cause the chalk to crack and fall off.
Other reasons the chalk paint might be coming off the glass surface include bad chalk paint and exposure to moisture. However, when chalk doesn’t stick to glass, it’s usually because the glass is filthy.
So before you apply the chalk, ensure the glass is clean.
How To Apply Chalk Paint On Glass?
Applying chalk paint on glass is pretty easy. The main part of the task is to ensure that the glass surface is clean. To apply chalk paint on glass, you need the following tools:
- A Bottle Of Rubbing Alcohol Or Isopropyl
- Paper Towel
- A Sealant Or Clear Topcoat
- A Paintbrush (preferably, a small paintbrush)
- Chalk Paint
- Fine-Grit Sandpaper Or Sanding Block
Here is how to apply chalk paint on glass:
- Wipe The Glass Surface With Rubbing Alcohol
- Mix The Chalk Paint
- Apply Thin Coats Of Chalk Paint On The Glass
- Sand Lightly To Achieve A Distressed Finish
- Seal Or Bake The Chalk Paint If Needed
Now, let’s get to work.
1. Wipe The Glass Surface With Rubbing Alcohol
The first step is to clean the glass surface with rubbing alcohol. Rubbing alcohol is a mild solvent that will remove tough stains and grease from the glass surface. If you can’t get rubbing alcohol, you can use a degreaser.
To clean the glass, pour some rubbing alcohol on a clean cloth. Then use the cloth to wipe the entire surface of the glass.
If you are painting a glass bottle, you can put your hand inside the glass bottle and wipe it. Ensure your hands are clean before wiping the glass surface. When the glass is clean, leave it to dry.
Related Read: Is Chalk Paint Washable?
2. Mix The Chalk Paint
The next step is to mix the chalk paint. Chalk paint usually comes in powder form and you can’t paint with that. So you need to mix the paint with water.
Ensure to follow the instructions on the container of the chalk paint when you want to mix it.
Usually, you only need 1/4 cup of water to mix the chalk but this might not be the case with the brand of chalk paint you bought. When the chalk has been well stirred, then you are ready to paint.
Related Read: Can You Mix Chalk Paint With Latex?
3. Apply Thin Coats Of Chalk Paint On The Glass
The next step is to paint. Chalk paint can be applied using any of the painting methods but for glass surfaces, it’s better to use a paintbrush. A small or medium-sized paintbrush will do.
To paint, put the paintbrush inside the mixed chalk paint and then apply the paint on the glass surface. Start with thin or light coats.
If you applying the chalk heavily to the glass, it will be difficult to control. You will also have a lot of brush marks when the paint dries.
When you have applied the first thin coat of chalk paint on the glass, leave it to dry. Chalk paint dries enough for another coating in minutes. For best results, leave the chalk paint for about 10 minutes. Then apply a second thin coat.
You can apply up to 3 thin coats of chalk paint on the glass. Ensure to cover every inch of the glass surface except you have a reason not to.
Related Read: Can You Apply Chalk Paint With a Roller?
4. Sand Lightly To Give A Distressed Finish
When the final coat of chalk paint has dried, you can sand the coating lightly to give a distressed finish. A distressed finish makes the glass look different.
To distress the chalk, rub a very fine-grit sandpaper, sanding pad, or sanding block against the chalk finish. Don’t use force if not you’ll sand more than you need to. Pay attention to the parts of the glass where there are writings or drawings.
Sanding lightly also helps to remove brush marks and imperfections on the glass surface. It gives the chalk a smooth finish too.
Related Read: Do You Sand Between Coats Of Chalk Paint?
5. Seal The Chalk Paint If Needed
Usually, sealing chalk paint on glass isn’t necessary. This is because the sealant will make the finish glossy and chalk paint is anything but glossy.
Many painters don’t like using a sealant on chalk because it sorts of removes the chalk finish. It makes the chalk look like an oil-based paint or oily finish.
However, sealing the chalk with a topcoat also preserves the chalk finish. Chalk isn’t a very durable paint and it’s very prone to moisture and scratches.
But sealed chalk paint is more water and scratch-resistant. So the chalk finish will last longer on the glass.
Ultimately, it’s your decision. To seal chalk paint, apply or spray about two coats of clear coat sheen on the chalk paint.
6. Or, Bake The Chalk Paint (Optional)
Another alternative to making the chalk finish last longer is to bake the chalk. This usually works for small glass bottles like jars and milk bottles. Baking is usually done after applying the chalk paint on glass. Never bake a chalk paint that has been sealed with a topcoat.
To bake the chalk, let the paint dry. Then put the painted glass in an oven and set the temperature. The usual temperature to bake chalk paint is between 300 degrees Fahrenheit and 350 degrees Fahrenheit. When the temperature of the oven is between this range, let the chalk paint bake for about 20 minutes.
If you are baking chalk, always keep watch on the glass and the oven. This is because some glass materials are not as strong as others.
Sugar glass for instance can shatter inside the oven if exposed to a sufficient heat source. So this isn’t a task to carry out carelessly.
When you have completed all of these steps, you have successfully applied chalk paint on the glass.
Do You Have To Seal Chalk Paint On Glass?
You don’t need to seal chalk paint on glass unless the glass surface that is painted will see a lot of action. Chalk paint is used on glass for its district finish.
Chalk when dry gives a dull and flaky appearance. But if you seal the chalk paint, you will not get dull or flaky. You will get a glossy appearance. So sealing chalk paint on glass almost seems unnecessary.
Sealing chalk paint on glass is done by applying a coat or two of clear topcoats like polyurethane or clear oil-based enamel on the chalk-painted glass after the chalk has dried.
The sealant helps to preserve the chalk paint by making it more resistant to water and chipping. However, sealing a chalk-painted glass isn’t needed unless the glass will be used heavily.
Chalk paint isn’t as durable as other paint types. The finish is thin and can be easily damaged if it sees a lot of action. So if you are painting glass surfaces like windows or doors with chalk, you should seal the chalk paint.
This is because glass surfaces like windows and doors will be exposed to heavy touching and handling. This means the chalk paint if not sealed will be affected by greasy hands and dirty fingers.
Not to mention the fact that windows and doors are usually affected by dust, Ultraviolet rays, and harsh weather. All of these factors will ruin the chalk finish. So you can seal the chalk to protect it.
However, if you are using chalk paint on glass surfaces like milk bottles and flower vases, you don’t have to seal the chalk finish. This is because these surfaces will not see much action and the chalk finish will sit well on them.
Related Read: Does Chalk Paint Stick To Metal?
How Long Does It Take Chalk Paint To Dry On Glass?
It takes chalk paint about 20 minutes to dry enough to touch on glass. But it will take about 2 hours for the chalk paint to fully cure when painted on glass.
Chalk is a light water-based finish and like all latex paints, chalk dries quickly. But the drying time of the paint relies on other factors like room temperature and the number of coats applied.
Chalk paint dries super-fast because of its water-based and thin nature. The paint is usually dry enough for another coat in minutes and cures fully in about an hour.
You can complete a whole chalk paint application on glass in less than 2 hours if the chalk is mixed correctly.
However, like other paint types, the drying time of chalk on glass depends on a few factors like the room temperature, humidity, and amount of coats applied.
If the chalk is painted at a cold temperature below 50 degrees Fahrenheit, it will take longer to dry. I painted at a temperature above 85 degrees Fahrenheit, the paint will dry too quickly and eventually crack.
Also, if you apply too many coats of chalk, it will take longer for the paint to cure. The more coats applied, the longer the drying time.
Related Read: How To Paint Over Chalk Paint?
Does Chalk Paint Scrape Off Glass?
Chalk paint does scrape off glass because the paint doesn’t soak into the glass surface since glass surfaces are slick and not textured. But it’s not advised to scrape chalk off glass because you can end up scrapping the glass surface.
Chalk paint like many other paint types can be scrapped off glass. This is because glass surfaces don’t have any fiber or grain for the paint to soak into. The paint just sits on the glass and dries so it’s easier to scrape it off.
To scrape off chalk paint from glass, it’s advised to use a plastic paint scraper. This is because using metal paint scrapers will most likely result in you scratching the glass too.
But the problem here is plastic paint scrapers might not be strong enough to remove the chalk paint from the glass. Even if it does, you’ll still notice some paint stains left on the glass.
So the best way to remove chalk from glass is to use a solvent like rubbing alcohol. You can also use white vinegar, hair spray, or mineral spirits. Just apply any of these solvents on the chalk paint and let it dissolve. Then wipe the paint from the glass with a clean cloth.
Can You Put Chalk Paint On A Mirror?
You can apply chalk paint on a mirror because chalk paints stick well on mirrors. But it’s best to use chalk paints designed for use on glass surfaces to paint mirrors.
Also, to put chalk paint on a mirror, you should use synthetic or natural fiber paintbrushes. Like other glass surfaces, start with thin coats of chalk paint on the mirror and let each coating dry before you apply another.
However, painting a mirror over chalk doesn’t seem appropriate because it prevents you from seeing reflections in the mirror which is what the mirror is there for. But you can paint the mirror frame with chalk paint to give it a matte or distressed appearance.
Related Read: Does Chalk Paint Withstand Weather?
Overall, it’s possible to use chalk paint on glass. Just ensure to clean the glass with a solvent first to get rid of grime or dirt that can repel the chalk paint. If the glass surface is prepped properly, chalk paint will sit and dry nicely on the glass.