Can You Use Emulsion On Wood?

Contents:

• Why seal emulsion paint on wood?
• Best sealants for emulsion paint on wood
• How to seal emulsion paint on wood
• Common mistakes
• Key considerations

Redecorating a space can be an exciting time, but it also comes with its fair share of questions, with a common query being, can you use emulsion on wood? Emulsion paints are water-based with vinyl or acrylic added, typically designed for walls and ceilings for interiors.

When it comes to using emulsion paint on wood, this is possible, but as emulsion paint is not specifically designed for wood, it may not be as durable as traditional wood paints. However, you can use emulsion paint for wood when it is prepared and sealed properly.

Today, we are going to answer, can you use emulsion on wood? We will share expert advice, tips, steps, and guide you through how to seal emulsion on wood, to ensure successful painting results.

When using emulsion paint for wood, it is essential that it is sealed effectively. Here is why sealing emulsion on wood is important:

• Protection from moisture – Emulsion paint is not as durable on wooden surfaces as traditional wood paint. Therefore, priming and sealing is vital for preventing any moisture entering beneath the paint, which could cause peeling and cracking. 

• Increased durability – Standard vinyl matt emulsion is not designed to withstand the knocks interior wooden trims often experience. By sealing it effectively, however, it can help the paint last longer.

• Enhanced finish – Sealing emulsion on wood helps create a smoother, more professional look, crucial for both interior and exterior spaces. Priming improves adhesion and a clear varnish or sealant provides a glossier appearance whilst adding protection against wear and tear.

• Easier cleaning – Sealed surfaces will resist stains and dirt better, particularly in high traffic areas like hallways and kitchens. Unlike some other paints, spills and scuffs can be wiped away with ease, resulting in easier maintenance over the long run.

It is important that you choose the right type of sealant to ensure long term durability. The sealant you use depends on a few factors, including overall budget and the final look you want.

Here are the best sealants when using emulsion paint for wood:

• Acrylic Varnish – If you’re looking for a transparent finish, acrylic varnish is a good choice. As well as resisting yellowing over time, acrylic varnish has good UV-resistance and dried quickly. It provides good protection, ensuring little maintenance in the future.

• Clear Wax – Unlike some heavier sealers, such as spar urethane and polyurethane, clear wax is ideal if you’re looking for a soft, vintage look. It is a popular sealant for tables and side tables in areas of high traffic, offering moderate protection against wear and tear. The application does not need as much ventilation as other sealants and is less likely to discolour over time when compared to polyurethane. 

• PVA Glue Mix (DIY option) – This is a good quality, budget-friendly alternative. Diluted PVA glue is considered the best option, with a 1:1 ratio of PVA with water. When applied thinly, this DIY option is water-resistant, but it may not be as durable as some professional wood sealers like shellac or polyurethane. This can also be used as a primer to prevent any excessive absorption of emulsion paint. 

Step 1. Preparation   

Preparation is key before painting a wooden surface. Start by cleaning the surface of any grease, grime, or dust as this can impact adhesion. Next, sand the wood thoroughly until it is smooth and even. Prime the wood using a suitable primer to ensure proper adhesion and long term durability. Then, you can apply the emulsion. 

Step 2. Ensure the paint is dry   

It is crucial that you wait for the emulsion paint to fully dry. This usually takes at least 24 to 48 hours, but it can take longer. If you apply another layer before the paint has fully cured, it may affect durability, causing an uneven finish and smudging. Over time the paint may start to peel and fade, appearing discoloured. 

Step 3. Lightly sand the surface   

As well as sanding before applying emulsion paint, you should lightly sand the surface before adding any sealant. Sanding helps remove any imperfections and debris, helping the sealant adhere better for longer lasting results. It is recommended that you sand gently using fine-grit (220-320) sandpaper and remove any dust with a vacuum or clean dry cloth before adding a thin layer of sealant.

Step 4. Choose the right sealant   

You can choose from a range of different sealants, but before selecting one, you need to ensure you have the right one. 

• Polyurethane - This offers high durability and is a good option for wood furniture and flooring. It provides a smooth, glossy finish with a relatively longer curing time of at least 24 hours. 

• Clear wax - If you want a soft, natural look, clear wax is a good option. It will protect against scuffs and marks, but it does not offer as much protection or moisture resistance as polyurethane. 

• Varnish - Water-based varnish is recommended as it helps give emulsion painted wood a glossy or satin finish whilst offering long term protection. Some varnishes are designed for outdoor use, so it is important you consider this before application. Spar varnish is recommended for outdoor areas susceptible to high levels of moisture.

Step 5. Apply the sealant evenly  

You need to be careful when applying sealant to painted wood to ensure an even, smooth finish. 

• Use a brush, roller, or spray to apply the sealant. A clean natural-bristle or long-grained brush is recommended.

• The sealant must be applied thinly with even coats to avoid streaks. Thicker coats tend to take longer to dry and may become uneven, attracting dust. 

• When using a brush, lightly run its bristles over the entire length of the wood, tipping off each section at a 45-degree angle. This will help minimise and even prevent bubbles and brush marks. 

Step 6. Allow proper drying time  

Once you have applied the sealant, you need to wait for it to fully dry. Drying times differ depending on the type of sealant used and the surrounding humidity and temperature. For instance, varnish takes longer to dry than wax.

Here are the expected drying times of different sealants:

• Wax - Oil-based and clear wax sealants typically take around 8 to 24 hours to dry, but up to 2 weeks to fully cure.

• Varnish - Water-based varnish can be dry to touch in approximately 6 hours, but oil-based varnish generally takes 8 to 24 hours. You can expect to wait 7 to 10 days for a full cure, or 21 to 30 days in some cases. 

• Polyurethane - Water-based polyurethane sealant generally dried faster, within 6 to 8 hours, whereas its oil-based counterpart needed about 24 hours to dry to the touch. 

To check whether the sealant has dried, sand a small area first. If it begins to “ball up”, it has not dried. Wait another 3 minutes before testing again.

Once dried, you may need to apply multiple coats for extra protection, ensuring thin, even layers every time.

Step 7. Check the sealant  

Finish by inspecting the sealant and making sure it is smooth, uniform, and of course, fully sealed. If the surface is uneven, you may need to sand the area and reapply further applications of sealant.

• Sealing before the paint is fully dry - If you apply sealant before the emulsion paint has fully dried, problems are likely to arise, such as peeling, cracking, bubbling, tackiness, and uneven drying. Moisture becomes trapped beneath the sealant, preventing it from curing properly. Always wait for the paint to fully cure before adding any sealant.

• Using the wrong type of sealant - Some sealants may not bond well with emulsion paint and certain types of wood. Thin coats of water-based polyurethane varnish are recommended for a clear finish on emulsion painted wood, offering protection and durability. Other sealants may result in peeling and discolouration. 

• Applying too thick a coat - Avoid thick coats of sealant, as this can lead to unwanted streaks or cloudiness. This can also lead to the topcoat starting to bubble and peel over time and an uneven finish. Only apply thin, even coats, waiting for each one to dry completely before applying the next.

• Not sanding before sealing - Forgetting to sand before adding sealant will usually cause poor adhesion. The surface will likely be uneven, leading to a poor finish and appearance. Sanding is crucial for porous woods like oak and ash, as it can create a smoother finish by filling in wood pores.

If you’re still wondering, ‘can you paint emulsion on wood?’, yes, you can, but it requires thorough preparation and time. Emulsion paint is not specifically designed for wooden surfaces, from wooden trims to doors and furniture to skirting boards.

Emulsion on wood can look great, however, providing a modern, sleek finish. It is a good go-to option for people seeking a low-sheen or matt look for their interiors. As it is water-based, it is not considered suitable for outdoor use.

Emulsion paint is also not as durable as other paints designed for wood, like oil-based and acrylic paints. This is why efficient priming and sealing is important. Without adequate preparation and aftercare, emulsion paint may start to peel, chip, and discolour over time. In high traffic areas, such as hallways, it is likely to scuff easily, which can be difficult to clean and maintain. 

Always prepare the surface area before painting and sealing to ensure long-lasting, durable results.