Marcus Chen
Painting the exterior of a house is a time-consuming and labor-intensive process. One of the most important steps in this process is preparing the surface to be painted. This includes removing loose paint, which can be done by scraping or sanding. While it is not always necessary to sand down the entire exterior of a house, it is often recommended to do so, especially if the paint is loose, the surface is glossy, or you want a pristine finish. Sanding creates a smooth surface for paint to adhere to, and can help to remove imperfections. However, it is important to note that if your house was built before 1978 and has lead paint, you should hire a professional to remove the paint.
Do you have to sand down siding before painting?
| Characteristics | Values |
|---|---|
| Purpose of sanding | To obtain a smooth finish, allowing paint to adhere properly and cover imperfections |
| Surfaces requiring sanding | Wood, metal siding, surfaces with fillers/putty/spackle, areas with bubbling/blistering/chipping/peeling paint, surfaces with mill glaze |
| Tools | Power/electric sander, sanding sponge, belt sander, orbital sander, hand-held palm sander, scraper |
| Process | Remove loose paint, sand to a feather edge, smooth edges, fill gouges with spackle, dust off sawdust, prime bare wood |
| Precautions | Avoid sanding if lead paint is suspected, be cautious when using a pressure washer to avoid water damage, ensure the sander is at full speed to prevent gouging |
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What You'll Learn
Scraping off loose paint
There are various tools you can use for scraping, such as a painter's multitool, a stiff scraper, or a carbide scraper. For hard-to-reach areas, such as corners and tight spots, use a scraper with two hands to avoid gouging the wood. It is important to select a scraper with a hard carbide blade instead of a mild steel blade, as the latter will dull quickly and may damage the wood.
Once you have the right tool, start by scraping off as much of the loose, dried paint as possible without gouging the siding. If you do end up with gouge marks, you can sand these areas down and fill them with vinyl exterior spackle to create a smooth surface. After scraping, you may want to sand the siding to level out any remaining paint ridges and create a smoother finish for your new paint to adhere to.
If you are dealing with multiple layers of old paint, you may want to consider using a chemical stripper or an infrared paint remover to soften the paint and make it easier to scrape off. Always follow the manufacturer's instructions for these products and take the necessary safety precautions, especially if working with lead-based paint.
After scraping and sanding, it is important to clean the surface thoroughly to ensure good adhesion for the new paint. Remove any remaining dust, debris, and loose paint chips before applying a primer.
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Using a power sander
If your existing siding is in good shape, you may not need to sand it down before painting. However, if your existing paint is peeling, cracking, or bubbling, you will need to remove it to ensure a smooth and flat surface for the new paint. In this case, using a power sander can be an effective way to prepare your siding for painting.
Sanding is typically done in two stages. The first stage involves removing the paint cover using coarse 60-grit sandpaper, which will create cuts in the wood. The second stage requires following up with medium 100-grit sandpaper to smooth out the surface. It is important to discard sanding discs that become covered with paint and to avoid using the sander in rainy weather.
For areas that are hard to reach with a power sander, such as corners and tight spots, use a scraper with two hands to avoid gouging the wood. If gouge marks occur, sand these areas down and fill them with a vinyl exterior spackle to prevent them from showing through the new paint job. After sanding, dust off any sawdust and remaining debris, and caulk any visible openings and seams.
By following these steps and using a power sander effectively, you can efficiently prepare your siding for painting, ensuring a smooth and professional finish.
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Filling gouges with spackle
When it comes to painting siding, preparation is key. If your siding is in good shape, you may only need to give it a thorough wash. However, if your siding is old and the existing paint is peeling, cracking, bubbling, blistering, chipping, or peeling, you'll need to remove the paint to ensure a smooth, flat, and paint-free surface. This can be done with a power sander, a scraper, or a pressure washer.
Sanding is an important step in preparing siding for painting, as it helps to create a smooth surface for the paint to adhere to and can help to remove any loose pieces of wood or splinters. It is recommended to use coarse 60-grit sandpaper followed by medium 100-grit sandpaper to ensure a smooth surface. When using a power sander, it is important to maintain even yet firm pressure to avoid gouging the surface of the wood. For any areas that are difficult to reach with a power sander, such as corners and tight spots, a scraper can be used. However, it is important to use both hands to avoid gouging the wood.
If you do end up with gouge marks during the preparation process, these can be filled with spackle. Vinyl exterior spackle can be used to fill holes and gaps, and it may be necessary to apply a second coat to ensure that the area is evenly filled. Once the spackle has dried, it can be sanded with fine-grit sandpaper to smooth over the patched areas and eliminate any bumps or ridges. This process may need to be repeated to ensure that the hole is completely filled and smooth.
In addition to spackle, other fillers such as wood filler or epoxy filler can be used to fill holes and gouges. For holes and gouges larger than 1/2 inch, an epoxy filler or Bondo, a polyester compound, is recommended. Bondo does not adhere well to paint or smooth surfaces, so it is important to sand the area around the repair to bare wood. If the hole or gouge is deep, you can use a chisel or putty knife to create small crevices around the perimeter to give the filler more area to cling to. After filling the hole, the area can be sanded with a random-orbit sander to smooth the surface. For holes and gouges narrower than 1/2 inch, Elmer's interior/exterior Carpenter's Wood Filler can be used.
After filling any holes or gouges and ensuring that the surface is smooth, it is important to prime the siding before painting. A latex primer that is tinted towards your finished color can be used, and it is important to allow the primer to dry thoroughly before painting. Caulking can also be used to fill holes and create an airtight seal to prevent moisture from getting underneath the siding, which can lead to mould. Once the prep work is complete, you can apply the exterior paint using a brush, roller, or paint gun.
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Priming bare wood
When it comes to painting wood siding, preparation is key. If the existing siding is in good condition, a thorough cleaning may be sufficient. However, if the paint is peeling, cracking, bubbling, blistering, chipping, or peeling, it is necessary to remove it to ensure a smooth and flat surface. Power sanders, such as a commercial-grade seven-inch sander, are recommended for large areas, while scrapers can be used for corners and tighter spots. After sanding, use a vinyl exterior spackle to fill in any gouge marks to prevent them from showing through the new paint.
Once the surface is smooth, it's time to prime the bare wood. Priming serves several purposes, including creating a smooth finish, improving paint adhesion, and preventing issues like streaking and brush marks. It is recommended to use a latex primer tinted toward your finished colour. Allow the primer to dry thoroughly before painting.
For bare wood, sealing and priming are crucial steps. Wood knots, for example, can bleed through paint over time, so applying a specialised knot sealer or shellac is recommended. After the sealer has dried, apply a primer, either oil-based or latex, using a brush, roller, or sprayer. Lightly sand between coats to smooth down any raised spots and ensure a uniform finish.
When priming bare wood, consider the type of paint you will be using. Chalk paint, for instance, often doesn't require primer and results in a matte finish. Latex paint is easy to clean up and quick-drying, while milk paint is a natural option that penetrates the wood for durability. Oil-based paint provides a smooth finish but takes longer to dry, and multiple coats are often required for full coverage and desired colour depth.
Additionally, when painting bare wood, it is important to stir the paint thoroughly and apply thin, even coats in the direction of the wood grain. Using a tinted primer can reduce the number of topcoats needed, and for dark colours, a grey-tinted primer is recommended. Overall, taking the time to properly prepare and prime bare wood will result in a smoother finish and longer-lasting paint job.
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Choosing the right sheen
While preparing to paint siding, it is important to consider the sheen of the paint. The sheen is the level of shine or glossiness of the paint. The higher the sheen, the easier it is to clean the surface. However, a higher sheen may also show more imperfections on the surface.
When choosing the sheen for your siding paint, consider the condition of the surface. If there are imperfections or uneven areas, a lower sheen paint may be a better option as it will help to hide these flaws. A flatter sheen will also result in fewer lap marks during the painting process. On the other hand, if you are looking for a sheen that will make your accent colours pop, a higher sheen, such as a soft gloss, may be more suitable.
It is also important to consider the type of siding you are working with. For example, if you have wood siding, you may need to sand the surface before painting to create a smooth finish. In this case, a lower sheen paint may be preferable as it will be less likely to show any remaining imperfections. On the other hand, if you are working with fibre cement siding, sanding is not necessary, and you may have more flexibility in your choice of sheen.
Additionally, the sheen of the previous paint on the siding should be considered. In some cases, you may need to sand the surface if you are changing to a lower sheen paint. For example, if the siding currently has a semi-gloss finish, sanding may be required before applying a satin sheen. However, if you are applying a semi-gloss over a satin finish, sanding may not be necessary.
Ultimately, the choice of sheen will depend on the specific circumstances of your siding and the look you are hoping to achieve. It is always a good idea to test the paint on a small area or swatch to ensure it meets your expectations before proceeding with the full painting project.
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Frequently asked questions
Yes, sanding your siding before painting will ensure that the paint adheres properly and dries to a smooth, even finish. Sanding is especially important if your siding has a glossy finish, or if there is loose, flaking, bubbling, blistering, chipping, or peeling paint.
For large areas of siding, you can use a commercial-grade seven-inch power sander. For smaller areas, you may want to use a sanding sponge, or a five-inch power disc sander. For corners and tighter spots, use a scraper.
For the initial sanding, use coarse 60-grit sandpaper. Then, follow up with medium 80-120-grit sandpaper to ensure a smooth surface.
