Caulk and seal any windows or openings to prevent air and water from leaking in. This may be the most important part of the prepping process. It's important to have a well-maintained, beautified, non-rotting wood house, but it's just as important to make sure that the windows, cracks and openings aren't leaking air or letting in water, which can ruin the interior of your house. Depending on the severity of the deterioration, you can even resort to using a heavy duty, professional grade, industrial caulking.[6]
When the primer is dry, caulk all small joints (less than ¼-inch-wide) in the siding and trim. Most pros use siliconized acrylics—paint won't stick to straight silicones—but Guertin and O'Neil like the new, more expensive urethane acrylics for their greater flexibility and longevity. O'Neil stresses that it's shortsighted to skimp on caulk. "If the joint fails, you're back to square one." Guertin uses the lifetime rating as his quality guide. "I don't expect 35-year caulk will last 35 years, but it should last longer than a 15-year caulk."
Painters often tint primer close to the color of the top coat, but Wallis thinks that's a recipe for "holidays," or missed spots. Instead, he tints his primer a contrasting color. "If I can see the color coming through, I know I need to apply more paint," he says. On the cottage shown in this story, he chose a gray-blue primer to go under a peach top coat.
#2 Many time, homeowners complain about the paint quality as they often see stains come through the new paint and show up on the wall again. Again, it is important to prep the surface, ust the proper primer. If you have tough stains on the exterior walls prior to painting, then make sure you use a quality stain block to prevent the stain from bleeding through.
To the touch, they still have the chalky feel of flat finishes, but with a slight waxy smoothness. The same paint color will appear slightly richer in a satin sheen than it does in a flat sheen. Satin/eggshell finishes can be wiped down or even hosed with water. Because of the hint of shine, satin paints have a somewhat more luxurious appearance than flat paints. 

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