If you are using latex acrylic paint you need at least two hours of sun for exterior paint to dry before the rain comes. If heavy rain is forecast or several days of rain are coming in the next few days, you will need about six hours of good sun to dry the paint thoroughly enough to not be affected. Paint will dry to the touch in one hour or so depending on the heat of the day. It takes about five days of normal weather for paint to dry all the way through and for the paint film to reach its maximum hardness and durability.
If it rains before the paint surfaces dry the rain will wash some of the paint off that were painted last. This is rarely a problem because the surfaces, when dry the next day, can just be repainted.
Exceptions to this rule would be if you are using oil base pant. Oil base takes longer to dry and therefore rain should not be in the forecast for about 24 hours. Oil base paint is not recommended on exterior surfaces in southern climates. The oil base paint weathers very quickly in a sunny climate and loses its gloss and does not have the flexibility it needs to endure the hot sun. It will generally crack and peel much more readily then acrylic paint. It is also begins to break down in three or four years and becomes very susceptible to mildew which feeds on the resins in the oil base paint. It is subject to rapid color fade and chalking.
How soon can you paint a house exterior after the rain?
Generally if the surface is dry to the touch you can paint the surface if using acrylic paint. The acrylic paint allows small amounts of moisture to pass through the coating from the surface to the air. It is a rare occurrence for acrylic paint to bubble due to moisture.
If using oil base, which is not recommended, you must have a perfectly dry surface which may take one or two good days of drying weather.
Do you have a house exterior or interior that you want to paint while it is actively raining, though the actual painting surface is not being rained on? Or perhaps you are wondering if the presence of rain or general climatic conditions will adversely affect the quality of your paint job. Commonly asked questions include:
Will it cause the paint to run?
Will it take so long to dry as to affect its eventual cured state?
Will it affect the paint's color or texture?
Exteriors and Interiors, Short Answer:
Yes, you can paint both the exterior and interior of your house when it rains. Exterior has limitations, detailed below.
Interior has no reasonable limitations. As long as the interior walls are dry and you do not expect them to get wet, you can paint. Keep in mind that windows left open during interior painting often experience sprinkles on the sill or the wall below the window.
Exteriors, Detailed Answer:
Many experts recommend against applying paint at first sight of a rain cloud. But if you live in a rain-prone area, you would never get any work done if you retreated inside the moment the first drop fell.
Professional painters cannot afford to stop exterior painting every time a rain cloud comes onto the horizon. So how do they do it?
Painting season is not determined by terms such as "fall" or "winter," but by climatic conditions such as moisture and temperature.
As long as you are safely within those climactic boundaries, it can be considered painting season.
As you might expect, house exteriors are the most critical area to consider when precipitation has occurred or will occur.
4 Questions to Assess Whether or Not You Should Paint
1. Is the Surface Visibly Wet Right Now?
Is the surface that I intend to paint currently wet? Even a few drops count as wet.
2. If Not, When Was It Last Wet?
Even if a surface does not appear to be wet, it might have latent moisture that could affect your paint.
An exterior wall that was rained on may require 4 hours of drying time in direct sunlight and 72+ F temperature to be fully dry for painting. Ideally, you would want to wait a full work day for the surface to dry.
Even if the flat surfaces have dried, other areas might not be, such as:
Sections that are hidden from the sun.
Trim and molding.
Hairline cracks in the siding
A common scenario: You touch the wall and it feels dry. But when you run your brush across a nail hole, this releases built-up water. If you do not catch this right away, the water drips down your newly painted surface, creating light streaks. The only cure for this is an additional coat of paint.
3. Is the Temperature Right?
Is the outside temperature below the minimum recommendation as specified on the paint can? Temperature and moisture work in conjunction with each other. The lower the temperature, the longer it will take for your exterior surface to dry.
4. Will Temperatures Drop Below Minimums?
Will the temperature drop below the minimum within 8 to 10 hours of paint application?
Be reasonable, though. Some paints can be applied in temperatures as low as 34 F. If you are painting at exactly 34 F at 10:00 am, and you expect it to hit freezing at 6:00 pm, you are unreasonably pushing the envelope. Give yourself a buffer zone.
Most people think painting in rainy weather is impossible. While it may not be ideal, it can be done. If you follow certain techniques then you can easily do painting in rainy weather. It may sound like a bad idea, but done right rainy weather will not affect the quality of painting on your exterior walls. If you live in an area where there it rains 8 months a year, then instead of waiting for too long, you can paint your home or office right away as I have some surefire ways for painting in rainy weather. Having a company come set up a Scaffolding outside can help you reach higher place on the outside of your house and is much safer then just using a ladder.
Before discussing simple and easy ways for doing paint in rainy weather, I must tell you why it is not suggested to paint in rainy weather. In rainy weather, the humidity increases when temperature slows down causing problem in drying of paint that is why experts usually suggest waiting instead of painting in rain. Another reason is that if you paint in rainy weather then it takes extra time in drying and mostly scratches appear on the walls after drying. Now, we have to do something that can help us in avoiding these problems while painting in rainy weather.
Easy To Follow Ways for Painting in Rainy Weather
Now for some time, just remove this thing from your mind that it is not safe painting in rainy weather, as you will see it definitely is. I know you are excited to know how to paint safely in rainy weather so here are some ways.
Painting Before it Rains
If you have a rainy weather in your locality and weather reports are saying that it will rain in the next 24 hours then you may start painting without any fear but do confirm that humidity is not too high as too much humidity is dangerous for the paint. Here I must tell you that there are special paints available in the markets that are designed for painting in rainy weather. These paints dried very fast and they are not much affected by the humidity so prefer using these paints instead of ordinary paints. If it rains after 3 to 4 hours of applying paint then there is nothing to worry, as paint usually gets dry within this time.
If your walls are not wet then it means there are ready for painting so just go for it without worrying about the coming storm or rain.
Painting after Rain
If there has been raining continuously for several days or last 24 hours then wait for the right time. Keep on reading or watching weather news time by time to remain update about the current and upcoming weather conditions in your locality. If it stops raining and reports says that weather will remain clear for next few hours then you can easily start painting but before that, you have to dry your walls. You may use fast and efficient fans or dryers for drying your walls. I am serious, these things really works. When you feel that, the walls are fully dried then go for painting by taking the name of God. Here, I have one tip for you. Avoid using oil paint if you are not sure that the walls are dry, as oil paint does not give good finishing if it is applied on wet walls. Use latex paints instead for painting in rainy weather as they can work well even if the walls are a bit wet.
Painting during Rain
If the walls of your home or office are covered with shades in such a way that rain does not directly falls on the walls then you may also paint when it is raining but before doing so please confirm that the walls are dry enough.
Prefer Painting Early Morning
Experts usually suggest painting early morning, as paints get dry easily during day timings then at night. This is because temperature decreases and humidity increases during night making it difficult for the paint to get dry properly.
Some Tips and Tricks
Before doing painting in rainy weather, it is usually suggested to ask a few questions from you. Firstly, you should ask that the walls you are going to pain are dry or not. If your answer is no then dry the walls first. Secondly, ask yourself whether it will rain during the next 8 hours or not. If your answer is no then go for painting, otherwise wait for the right time. Is temperature appropriate outside or not? If temperature is below the minimum temperature level needed for painting then it is better to wait for the temperature to rise. Prefer using those paints that are designed to work at temperature as low as 34 degrees Fahrenheit. I hope this guide for painting in rainy weather will help you in applying paint smoothly.