Elena Rossi
Before painting an exterior surface, it is important to clean it thoroughly. Power washing or pressure washing is an effective way to clean exterior surfaces and ensure paint adheres properly. Power washing uses heated water, while pressure washing does not. Both methods use high-pressure water to remove dirt, dust, mould, mildew, and other grime. Soft washing is another option, using low pressure and a biodegradable cleaning solution to clean exterior surfaces. It is important to use the correct method and equipment to avoid damaging the exterior surface. The surface should be allowed to dry completely before painting, with drying times varying depending on the climate and the type of paint used. Filling holes, cracks, and imperfections is also part of the preparation process to ensure a smooth and receptive surface for the paint to bond to.
| Characteristics | Values |
|---|---|
| Purpose | To clean the exterior surface before painting to ensure the paint adheres to the surface and lasts longer |
| Techniques | Power washing, pressure washing, soft washing, using a cleaning solution with a sponge or cloth |
| Timing | Should be done at least 2 days before painting to allow the surface to dry completely |
| Surfaces | Wood, vinyl, metal, stucco, drywall, raw wood, siding, decks, fences, roofs |
| Precautions | Use correct water pressure, prep the surface before washing, be careful not to damage the surface or hurt yourself |
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What You'll Learn
Power washing vs. pressure washing
Before painting an exterior surface, it is important to clean the surface to ensure the paint adheres properly. Power washing and pressure washing are effective ways to clean the exterior of a house before painting. While the terms are often used interchangeably, there are some differences between the two methods.
Power washing and pressure washing both use highly pressurized water to clean hard surfaces. However, power washing uses heated water, typically ranging from 2,200 to 3,500 psi, while pressure washing uses unheated water. The combination of high pressure and heated water in power washing makes it more effective at removing stuck-on dirt, residue, salt, mildew, and mold. Power washing is ideal for situations where the surface is heavily soiled or has a lot of dirt or other matter to clean off. It is also useful for controlling weeds and moss, as the hot water can kill them and prevent them from growing back immediately.
On the other hand, pressure washing is less harsh on surfaces, making it suitable for use on masonry, brick, and concrete. It is commonly used for residential applications and smaller jobs. Pressure washing effectively removes dirt, dust, mud, grime, stains, salt, and even chewing gum.
When preparing an exterior surface for painting, it is important to consider the type of surface and the level of cleaning required. Pressure washing is generally suitable for most exterior surfaces, while power washing is recommended for heavily soiled surfaces or larger jobs. However, it is important to note that power washing can potentially damage softer surfaces due to the high-pressure hot water. Therefore, it is advisable to hire a professional for power washing or pressure washing to avoid accidental damage to the surface or surrounding areas.
Additionally, regardless of the cleaning method chosen, it is crucial to ensure that the exterior surface is completely dry before painting. The drying time may vary depending on the climate and weather conditions, but it is generally recommended to allow at least one day for latex paint and a full week for oil-based paint.
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Scraping and sanding
Identifying Areas for Scraping and Sanding
Before starting the scraping and sanding process, it's important to identify areas that require attention. Look for paint that is flaking, loose, peeling, bubbling, or cracked. These areas will need to be addressed to ensure a smooth and receptive surface for the new paint.
Scraping
Scraping is the process of removing loose, peeling, or bubbling paint from the surface. Use a scraper designed for this purpose, being careful not to gouge the wood or underlying material. This step ensures that the new paint will have a clean surface to adhere to. Take your time with this process to avoid damaging the surface underneath.
Filling and Repairing
After scraping, you may need to fill any holes, cracks, or gouges with an appropriate filler. For wood surfaces, use a wood filler that matches your wood type. Allow the filler to dry completely according to the manufacturer's instructions. If there are rotted or damaged areas, use a wood hardener before applying the wood filler. In severe cases, wood replacement may be necessary before proceeding with the painting process.
Sanding
Once the filler is completely dry, it's time to sand the patched areas. Sanding creates a smooth, flush surface that blends seamlessly with the surrounding area. Use sandpaper or a sanding block to gently sand the filled areas, moving in the direction of the wood grain if applicable. Ensure you wear the appropriate protective gear, such as a dust mask and safety goggles, during the sanding process.
Final Surface Preparation
After sanding, remove any dust or debris from the surface with a tack cloth or a damp cloth. The surface should be thoroughly cleaned to ensure no residue remains, as this can interfere with paint adhesion. If necessary, use a gentle cleaning solution, applying it with a sponge or cloth, and rinse thoroughly with clean water afterward. Allow the surface to dry completely before proceeding with the painting process.
By following these steps for scraping and sanding, you will create a smooth and receptive surface, ensuring that your new coat of paint adheres properly and results in a high-quality, long-lasting finish.
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Priming
Before priming, it is essential to prepare the surface properly. This includes filling any holes, cracks, or gouges with the appropriate filler for the surface, such as exterior epoxy wood filler for wood surfaces. It is crucial to allow the filler to dry completely before sanding the area to create a smooth surface. For exterior wood surfaces, it is recommended to use a wood hardener before applying the filler if the wood is rotted or damaged.
Once the surface is prepared, the primer can be applied. It is important to choose a primer that is suitable for the surface and the topcoat being used. Follow the instructions on the primer carefully, including any specific application methods or drying times.
After priming, it is essential to allow the primer to dry completely before proceeding with the topcoat. Refer to the primer's instructions for the recommended drying time. Adequate drying ensures that the primer is fully cured and ready for the application of paint.
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Soft washing
To prepare for a soft wash, you should lock and close all windows. It is also important to cover or remove any items that could be damaged by water, such as light fixtures and electrical sockets. After soft washing, the surface should be allowed to dry completely before painting. In most climates, this typically takes 24-48 hours for exterior surfaces, depending on weather conditions.
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Drying times
If you are using latex paint, it is recommended to allow the surface to dry for at least one day before painting. For oil-based paints, a longer drying time is typically needed, and it is suggested to wait a full week before applying the paint. These drying times may need to be extended if you use a power washer or pressure washer to clean the surface before painting, as this can leave pockets of water that need to dry out.
The climate can also impact the drying time. For example, in Denver, where the climate is relatively dry, exterior surfaces typically take 24-48 hours to dry after cleaning. In more humid climates, it may take longer for the surfaces to dry completely.
To ensure the best results, it is recommended to allow the surface to dry completely before painting. This can take anywhere from a couple of days to a couple of weeks, depending on the climate and the cleaning method used. One source suggests that two "dry" days are sufficient, while another recommends waiting at least three to four days after power washing to ensure that all pockets of water have dried.
It is worth noting that waiting too long after washing the surface can also be detrimental. One source suggests that waiting more than a couple of months may be too long, as the surface may accumulate dirt and grime again, requiring another round of cleaning before painting. Therefore, the ideal drying time for exterior painted surfaces falls within a window that balances the need for complete dryness and the desire to paint while the surface is still clean.
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Frequently asked questions
Yes, absolutely. Washing the exterior of your house before painting is a crucial step in preparing your home to be painted. It helps to clean the siding, wood, and other exterior surfaces so that the paint sticks to it better. This helps the paint look nicer and last longer.
Power washing uses heated water and high pressure to clean the house exterior, whereas pressure washing does not use heated water. Both are great options for cleaning your home before painting it.
Soft washing uses a pressure washing wand with nozzles that deliver low pressure. A biodegradable cleaning solution sprayed at low pressure removes dirt, moss, mould, algae, and more from exterior surfaces like wood, siding, decks, fences, and roofs.
You should allow the exterior to dry for at least two days to a couple of weeks before painting. This will ensure that the substrate is completely dry before you apply paint to it.
Some common mistakes to avoid include not properly filling in cracks and holes, not scraping or sanding existing glossy paint, and not addressing issues like water damage, mould, or structural problems.
