![]() The dew point is the point when moisture appears on surfaces. The temperature needs to be at least 5 degrees above the dew point in order for the paint to dry properly. The dew point will affect the drying time the most. Heat and air movement are critical for the paint to dry. ![]() Wind and warm temperatures speed up the drying time. High humidity, dark colorants, cool temperatures and reaching the dew point all slow up the drying time. If the paint hasn’t had sufficient time to dry, this can turn into one ugly mess! If this happens, the best solution is to wait till weather clears then repaint. The water collects on the top rim of the gutter, runs down the front edge and then collects in big drips underneath on the bottom of the gutters. The gutters are at the highest risk for issues because they are the most exposed. Under normal circumstance, most paints can withstand a shower or two after about 4 hours of drying time. This answer varies with humidity, dew point, temperature, wind, paint color and the product that is used. But, with repaints, there shouldn’t be such pressure, so there’s no reason to rush and deliver anything but a proper paint job. We’ve cleaned up a lot of gutters because of this problem, and sheesh, what a mess! To be fair, when there’s a deadline to meet and the general contractor is on your back and the buyers need to get moved into their home, painters aren’t left with a whole lot of options. The problem is that oil-based paints do not hold up to the elements and will crack and peel off the gutters. New construction runs year-round, so painters may switch the gutter and/or trim paint to oil-based paint because it skims over and won’t rain off nearly as easily as their preferred water-based counterparts. Switching to oil-based paint during a rainy stretch is another practice which is frowned upon. I suggest you tell your painter to hit the road if they try to use this method. Red-eying the paint comprises solvent-based additives that flash off quickly and cause the paint to dry at an accelerated rate. This is a bad practice, because it voids the manufacturer warranty. Unscrupulous painting contractors “red-eye” their paint so that it will dry quicker. That means, for most exteriors, you would need a giant plastic enclosure protecting your home. ![]() ![]() The only safe way to paint in the rain is to have the areas completely covered and not in danger of taking on any moisture. The answer is a resounding “NO!” If your contractor is telling you they have a method for painting exteriors when it’s raining, I would be very skeptical. Let’s address the obvious questions: Can you paint exteriors in rainy weather? You may already realize that our greatest threat is moisture. Weather can affect exterior house painting and the Pacific Northwest has its challenges. ![]()
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