Priya Kapoor
Before painting over joint compound, it is important to prepare the surface by sanding and priming. Joint compound is used to repair and fill seams, nail holes, and cracks in drywall, and it can be applied with a trowel or putty knife. After the compound has dried, the area should be sanded to create a smooth surface. A primer is then applied to seal the joint compound and ensure that the paint adheres evenly. The type of primer and paint used, as well as the technique for application, can vary depending on the specific project and the desired finish.
| Characteristics | Values |
|---|---|
| Purpose | Repairs and fills seams, nail holes, and cracks in drywall |
| Application | Applied with a trowel or putty knife |
| Coats | Multiple coats may be required for full coverage |
| Drying | Allow to dry completely between coats |
| Sanding | Sand to smooth and remove excess compound |
| Priming | Use primer to seal and ensure uniform texture and colour |
| Painting | Apply paint after priming for best results |
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What You'll Learn
Sanding and smoothing the joint compound
Before painting over joint compound, it is important to sand and smooth the areas where the compound has been applied to achieve a smooth and uniform finish. Sanding will also help to remove any lumps or raised areas, ensuring a seamless and professional result.
To begin the sanding process, seal off the room to prevent the rest of the house from getting covered in dust. Wear protective clothing, including goggles, a dust mask or respirator, and a head covering to safeguard your eyes, lungs, and hair from the fine particles of dust produced during sanding. Place a drop cloth on the floor and cover any furniture with plastic or a tarp for additional protection.
For lower and middle drywall areas, use a hand sander or sanding block with semi-coarse sandpaper of 100 to 120 grit. Apply a push-pull motion, exerting even pressure inside the seams and along nail and screw patterns. Remember to keep the sander in constant motion and avoid abrupt stops or erratic movements to prevent swirl marks and uneven areas. If you need to reach higher wall areas and ceilings, a pole sander with an attached extension handle is ideal.
After sanding with semi-coarse sandpaper, continue with finer-grit sandpaper, such as 150 or 180 grit, to further smooth the areas. For delicate spots, such as inside corners and around electrical outlets, use sheets of sandpaper or a fine sanding sponge to feather out the compound into the drywall. Pay close attention to areas where the compound meets the drywall to ensure a seamless blend.
If you prefer a dust-free method, consider wet sanding with a damp sponge. Fill a bucket with warm water and dip the sponge into it before wringing it out. Begin by knocking down any high spots or ridges with the abrasive side of the sponge, using broad, circular strokes without applying too much pressure. Rinse and wring out the sponge frequently to prevent a buildup of compound. Finish by switching to the smooth side of the sponge and feather the joint compound outward from the joints, creating a hazy feathering effect.
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Using a primer
When choosing a primer, look for a product that is suitable for sealing drywall and creating a smooth surface. While any primer will work, some primers are specifically designed for this purpose and will provide better results. For example, Zinsser 1-2-3 has been recommended by professionals, and Kilz All-Purpose Latex Primer has been used successfully by others. If you are using a coloured paint, you can tint your primer to match, which will help you achieve a more uniform final colour.
Before applying the primer, ensure that the joint compound is completely dry. The drying time can vary, but it is typically recommended to wait at least 24 to 48 hours. Once the joint compound is dry, sand the area to ensure a smooth surface. Use fine-grade sandpaper to smooth out any thick areas of joint compound, and a wet sponge to remove any excess. It is important to wipe down the walls after sanding to remove any dust, as this will help ensure a smooth finish.
After priming, you may need to apply a second coat of primer, depending on the coverage. You can then proceed with your chosen paint colour. Remember to allow each coat to dry before applying the next, and always follow the manufacturer's instructions for the best results.
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Sealing the wall
Sanding
Start by sanding the areas where you applied the joint compound to create a smooth and even surface. Use fine-grade sandpaper if the joint compound is thick, and a wet sponge if it is smooth. Sand until all seams and holes are level with the surrounding wall, and there are no lumps or raised areas. Vacuum the room and wipe down the walls with a tack cloth or a damp sponge to remove any dust.
Priming
Priming is essential to seal the joint compound and ensure the paint adheres evenly. Choose a suitable primer, such as a PVA primer or a "new drywall" primer for larger areas. Primer creates a uniform surface, ensuring the paint colour is consistent and that there is no flashing or uneven paint absorption. Allow the primer to dry completely before proceeding.
Painting
Once the primer is dry, you can begin painting. It is recommended to use a roller with a suitable nap length, such as a 3/8” nap roller, to achieve an even finish. Follow the paint manufacturer's instructions for drying times and apply additional coats as needed.
It is important to note that proper preparation, including sealing the wall, is critical to achieving a professional-looking finish. Taking your time with each step will ensure the best results for your painting project.
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Using a topcoat
All-purpose joint compound is used to repair and fill seams, nail holes, and cracks in drywall. It is also used to fill in gaps and holes in walls. Typically, two or three finish coats of joint compound are applied after taping the seams. The first coat is usually an all-purpose joint compound, while the final coat is a topping compound.
Topping compound is a type of joint compound that is used to create a smooth, final finish. It is lighter, easier to apply, dries faster, and sands more easily than all-purpose joint compound. It also shrinks less, making it ideal for covering taped seams. The main disadvantage of topping compound is that it is less durable than all-purpose joint compound.
When using a topping compound for the final coat, it is important to ensure that the all-purpose joint compound is dry. The topping compound can then be applied in a smooth coat, and allowed to dry for a day. This process results in a smooth, even finish.
It is recommended to use a primer before applying the topcoat. Primer seals the joint compound, creating a uniform surface for the topcoat to be applied evenly. It also helps to achieve an even sheen in the finished product and can reduce the amount of paint needed. Sanding may also be required to smooth out the wall and ensure a smooth finish.
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Painting techniques
Yes, you can paint over all-purpose joint compound. In fact, joint compound is commonly used to create textured artwork.
Choose Your Compound
Joint compound, also known as drywall compound, comes in several varieties. For art projects, it is recommended to use a pre-mixed, all-purpose compound due to its smooth consistency and ease of use.
Mix Your Medium
While you can use joint compound straight out of the container, you may want to add colour and improve its flexibility and adhesion by mixing it with paint and a binding agent. Acrylic paint works well, and a binding agent like glue or a gloss medium will help reduce the risk of cracking or flaking. Mix it to a smooth, cream, batter-like consistency.
Apply the Compound
Using a palette knife or scraper, apply the mixed compound to your canvas or board. You can create a uniform layer or vary the thickness for more texture. Remember that the compound will shrink as it dries, so apply more than you think you need.
Create Your Texture
Use texturing tools to carve, scrape and shape the compound while it's still wet. You can create peaks, swirls, ridges, and more. Experiment and have fun!
Let it Dry
Allow the compound to dry completely before moving on. This can take a few hours to a couple of days, depending on the thickness of your application. If you want a smoother finish, you can use a damp cloth or sponge to smooth your design when it's nearly dry, or sand the edges when it is fully dry.
Paint Over the Texture
Once the compound is dry, it provides a great textured surface for painting. Acrylics work particularly well, but you can experiment with other mediums.
Seal Your Artwork
Finally, apply a sealant to protect your artwork and ensure the paint adheres to the joint compound.
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Frequently asked questions
No, it is not advisable to paint directly over all-purpose joint compound. You must first smooth out the compound with fine-grade sandpaper or a wet sponge, and then apply a primer to seal the joint compound before painting.
Sanding the areas where you applied the joint compound ensures that the patched walls are smooth for priming and painting. It is important to remove any lumps or raised areas and wipe off the dust after sanding to achieve a clean, smooth wall for the best results.
Primer seals the joint compound, which has a different texture than the rest of the wall and absorbs more paint. Not using a primer can result in an uneven finish, with the paint soaking unevenly into the joint compound.
You can use a standard PVA primer, which can be tinted to match your paint colour. If you are only doing small patches, you can also use "new drywall" primer, which is cheaper and available in gallons.
