FAQ About Exterior Paint

Exterior painting jobs can be a lot more work than you expected. Painting surfaces have to be cleaned and prepared. Supplies have to be purchased, loaded and unpacked. Specific techniques must be followed to ensure a proper paint job. Applying experience learned from others can simplify preparation along with saving time and frustration.

• What is a good method for painting aluminum siding? Brushing or spray-painting works equally well, however spray painting will go much faster. When spray-painting, use a spray can, not actual spray paint. Remove the old chalky surface from the aluminum before painting and if spraying use the appropriate pressure and tip size.         


• About how much time does an oil-based paint need to set before any type of precipitation? When the outdoor temperature is 70 degrees Fahrenheit or above, the minimum drying time would be eight hours. Any cooler temperatures and drying time would be increased one hour per 10 degrees lower. For instance, 60 degrees Fahrenheit would take nine hours.


• When can I paint after it rains? Wait at least 48 hours. Wood or masonry surfaces that have absorbed much moisture will not absorb the paint properly and eventually the paint will peel.


• Can I paint successfully in between storms that may lower the temperature?  Most exterior paint labels recommend the suggested temperature range for about 48 hours after it is applied. Adhesion problems, mildew and surface leaching can occur when paint does not cure correctly with cooler temperatures.


• How do I touch-up exterior paint? Apply the paint under the same type of weather conditions as it was originally painted. Duplicate the same application method of rolling or hand brushing when originally painted. Best results are achieved using the original paint that is thinned by 25 to about 50 percent.


• Is there an optimal outdoor temperature for outdoor painting? Some exterior paint may be applied at 35 degrees Fahrenheit. Check the label of the paint can for instructions. Many exterior paints require a minimum of 50 degrees Fahrenheit to set up properly.


• How do I avoid sloppy overlap marks? Overlap marks occur when the previous area just painted starts to dry before the new area you are painting. Paint in small sections to alleviate overlap marks.


• Should I paint when the temperature is over 100 degrees Fahrenheit? Painting with exterior paints in extremely hot temperatures can cause the paint to peel off later. The paint dries too quickly and does not adhere properly.