Marcus Chen
When it comes to painting a previously painted home, the question of whether to apply primer first depends on several factors. While some sources claim that primer is not always necessary, others argue that it is crucial, especially in certain situations. One of the most important considerations is the type of paint already on the surface. If the existing paint is oil-based and you plan to use a water-based or acrylic topcoat, using a bonding primer is recommended to ensure proper adhesion. This is because acrylic and latex paints may not adhere well to oil-based surfaces without primer. Additionally, if there are stains, smoke damage, or discolouration from crayons, grease, smoke, water damage, or mildew, primer is essential to prevent the old paint from bleeding through and affecting the new colour. Primer can also seal unwanted odours, such as smoke or pet smells.
| Characteristics | Values |
|---|---|
| When to use primer | When covering stains, grease, smoke damage, crayon, marker, mildew, or odours; when painting a lighter colour over a darker one; when using acrylic paint over oil-based paint; when painting porous surfaces; when painting exterior walls; when the previous paint job is falling apart; when patching holes or damaged siding; when dealing with masonry surfaces with high pH levels; when dealing with efflorescence; when the surface is glossy; when the drywall was not sealed initially |
| When not to use primer | When the new coat of paint is the same type as the old coat (e.g. both oil-based); when the surface is smooth, clean, and doesn't need repair; when the surface was previously painted with latex in a flat or low-lustre finish; when using a high-quality self-priming paint |
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What You'll Learn
Priming before painting: when is it necessary?
Priming before painting is not always necessary, but it is important to consider the benefits of using a primer. For example, if you are painting over a stain-blocking primer, it will prevent stains from bleeding through the finish coat. This is especially important if you are covering crayon, marker, or grease stains.
Priming is also necessary if you are making a dramatic colour change, especially when painting a lighter colour over a darker one. In this case, a tinted primer can help cover the previous tone and prevent the darker paint from bleeding through. Primer is also important for sealing in unwanted smells, such as smoke damage or nicotine odours.
The type of surface you are painting is another factor to consider. If the surface is porous, such as wood or drywall, it will require a primer to prevent the paint from soaking in and weakening the surface. Surfaces with a high gloss finish may also need a primer to help the new paint stick.
In addition, if you are painting over a previously painted surface that is chipping or peeling, it is important to prime first to ensure the new paint adheres properly. If the previous paint is still sticking to the surface, you may be able to paint directly over it without priming.
Finally, if you are using a water-based paint over an oil-based paint, or vice versa, it is important to use a primer to ensure the new paint adheres properly.
Overall, while priming is not always necessary, it can be helpful in ensuring a smooth and consistent finish, improving adhesion, and preventing stains and odours from bleeding through.
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Priming before painting: when is it unnecessary?
Priming before painting is unnecessary in a few cases. Firstly, if you are painting over a previous coat of paint that is still sticking to the surface, it is usually fine to paint directly over it without applying primer. In other words, if the old paint job is intact and not peeling or chipping away, it can act as a secure, sealed surface for the new paint. Additionally, if the wall is in good condition and the new paint is chemically the same as the old paint (for example, both are oil-based or both are latex), you may not need to prime. You can simply choose the new paint colour and proceed.
Another instance where priming may be skipped is when dealing with smooth, clean surfaces that do not require repair. In this case, using a high-quality self-priming or primer-in-paint product can be sufficient. However, it is important to note that not all self-priming products are created equal, and some may not deliver long-lasting results. Therefore, it is crucial to research and select a reputable brand.
When it comes to interior wall painting, especially over new drywall or drywall patches, some consider "primer-in-the-paint" products to be a marketing gimmick. While these products can save time and provide a consistent finish, they may not offer the same level of coverage or adhesion as a separate primer coat.
In summary, while priming is often recommended to ensure a smooth and durable paint job, there are certain situations where it can be skipped. These include painting over intact, well-adhered old paint, using chemically similar paint types, dealing with smooth and clean surfaces, and opting for self-priming products or "primer-in-the-paint" options. However, it is always important to properly prepare the surface by cleaning, sanding, and addressing any repairs before applying paint, regardless of whether a primer is used.
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Priming exterior walls
Preparation:
Before priming, it is crucial to prepare the walls. Start by removing any HVAC registers, outlet covers, light switch plates, nails, or other hanging hardware. Then, inspect the walls for any cracks, holes, dents, or imperfections. Use caulk or a lightweight spackling compound with a putty knife to fill and repair any holes or imperfections. Smooth the repaired areas with fine-grit sandpaper or a sanding sponge, then wipe away the dust with a damp cloth and allow the surface to dry completely.
Protect Adjacent Surfaces:
Use painter's tape to mask off moulding, trim, windows, and the ceiling to protect them from primer and paint. Cover the floors with a drop cloth to catch any drips or splatters.
Choose the Right Primer:
The type of primer you use will depend on the surface you are painting and the type of paint you will be using. For exterior walls, consider using an exterior primer designed for the specific surface, such as masonry or wood. If you are painting over stains, choose a stain-blocking primer. For drastic colour changes, a primer can provide a neutral base and reduce the number of finish coats needed.
Apply the Primer:
Start by "cutting in," which means outlining the wall with a 2-3 inch band of primer around the edges. Use a small paintbrush or corner pad for corners and areas where walls meet moulding and ceilings. For larger areas, use a paint roller. Apply primer to any spots that need special attention, such as patches, exposed wood, or areas treated with a stain blocker.
Allow the Primer to Dry:
Follow the manufacturer's instructions for drying time. Ensure the primer is completely dry before proceeding to the next step, which is usually painting.
Clean Up:
After priming, clean your tools and dispose of any waste properly.
Remember that priming exterior walls is a crucial step to ensure the paint adheres well and the finish is smooth and uniform. Always read the instructions on your specific primer and paint products, as well as taking the necessary safety precautions.
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Priming interior walls
Before priming, it is necessary to prepare the wall. Remove any hardware, such as HVAC registers, outlet covers, and light switch plates. Then, inspect the wall for any imperfections, such as cracks, holes, or dents, and repair them using spackling and a putty knife. After the spackling has dried, sand the wall to smooth out the repaired areas, and then wipe the wall clean with a damp towel or sponge. It is important to ensure that the wall is free of dirt, dust, and debris, as this will help the primer adhere properly. You should also use painter's tape to protect any surfaces that you do not plan to paint, such as moulding, trim, windows, and the ceiling.
When applying primer to interior walls, a key technique is the "cut in." This involves outlining the wall with a 2 to 3-inch band of primer around the edges, using a nylon-polyester paintbrush or corner pad. You should also apply primer to areas that need special attention, such as joint compound, patches in drywall, and any exposed wood. For larger areas of the wall, a paint roller can be used to apply the primer. It is important to wear safety glasses or goggles when applying primer to protect your eyes.
Primer helps to create a seal between the old paint and the new paint, preventing the old paint from peeling or cracking. It also improves paint adhesion, producing a uniform finish and blocking stains. In addition, primer can help to cover existing paint colours and blemishes, and can add texture to the walls. Without primer, the paint may absorb into the surface unevenly, resulting in an inconsistent finish.
It is important to choose the right type of primer for your specific needs. For example, if you are painting over stains or discolouration from smoke, crayons, grease, or water damage, you will need a stain-blocking primer. If the old paint is oil-based, you will need a bonding primer, especially if you plan to use a water-based acrylic topcoat.
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$17.47
Different types of primer
When it comes to previously painted homes, priming isn't always necessary, especially if your paint is in very good condition. However, it is important to consider the type of paint you are applying and the surface you are working with. Here are some different types of primers to consider:
Bonding Primers
Bonding primers are ideal for interior surfaces and can stick to a variety of materials, including glass, tile, Formica, and previously painted surfaces. They are a good choice for ensuring paint adhesion and preventing flashing and lap lines. However, they tend to crack when exposed to outdoor elements, so they are not suitable for exterior use.
Stain-Blocking Primers
Stain-blocking primers are designed to prevent stains from bleeding through the finish coat. They are commonly used to cover water, smoke, grease, crayon, marker, or grease stains. These primers are also useful when painting over a dramatic colour change, such as painting a light colour over a dark one.
Masonry Primers
Masonry primers are recommended when painting over masonry surfaces, such as concrete, brick, stucco, or plaster. These surfaces can have high pH levels, which can cause adhesion problems. Masonry primers also help prevent efflorescence, which are unsightly white crystalline deposits that can form on masonry surfaces.
Wood Primers
Wood is a porous material that requires priming to protect it from moisture, temperature, and bug damage. The type of wood primer depends on the condition of the wood. For stained wood or wood types like redwood or cedar, a stain-blocking primer is recommended. For unstained wood, a high-quality latex or oil-based primer can be used.
Metal Primers
Metal primers are designed for use on metal surfaces and can be general-purpose or specific to certain metals. For example, a Coo-Var Red Oxide Metal primer is suitable for ferrous metals like iron and steel, providing anti-corrosive protection. All-metal/surface primers are also available and can be used on a variety of metals in interior or exterior settings.
Drywall Primers
Drywall primers are used to seal new drywall and previously painted walls to ensure a consistent finish. They are especially important for porous surfaces and can be latex-based or oil-based, depending on whether you are applying wallpaper or covering a stain.
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Frequently asked questions
No, primer is not always necessary. If the previous paint job is still sticking to the surface, it's usually fine to paint directly over it. However, if the paint is peeling or falling apart, primer is necessary to ensure the new paint adheres properly.
Yes, if the old paint is oil-based and you plan to use a water-based paint, you will need to use a bonding primer to ensure the new paint adheres.
Using primer is recommended when making a drastic colour change, as it will prevent the old colour from bleeding through and affecting the new colour.
Surfaces that are porous, such as wood or drywall, will require primer, as paint will soak into these surfaces and weaken them. Surfaces with a high gloss finish may also require primer, as the new paint may not adhere well.
Primer can also be used to seal in stains and odours, such as smoke damage or nicotine odour. It can also save money, as it is cheaper than paint and helps achieve better coverage.
