Things You'll Need
Metal putty knife
Metal putty knife
Blue painter's tape
Painter's pale or 5-gallon bucket
Three to four inch paintbrush
While latex caulk is the appropriate material for sealing cracks on the exterior of a home, often people mistakenly use silicone instead. If you notice that your aluminum flashing has been sealed with silicone caulking, you're going to need to apply an oil-based primer to it or you will have problems with adhesion.
Never attempt to paint aluminum flashing without abrading and priming it first, or you will have problems with adhesion.
Few things inspire your average do-it-yourselfer more than the thought of remodeling the exterior of his or her home with a brand new coat of paint. Most experienced painters know the basics of applying paint to wood. However, when it comes to painting metallic surfaces like aluminum flashing, there are a few preparation techniques you need to know to make sure the finish will hold up over time.
Clean dirt, dust and cobwebs from the aluminum flashing using the pressure washer.
Use the metal putty knife to remove any peeling or loose paint from the surface of the aluminum flashing. Skip this step if the aluminum flashing is unpainted.
Use a wire brush to abrade the surface to promote paint adhesion. Do this by scratching the wire brush against the aluminum flashing in a circular, counter-clockwise motion.
Cover all areas you do not want painted with blue painter's tape.
Pour latex primer into the painter's pale or 5-gallon bucket. Fill it only about half-way.
Apply primer to the aluminum flashing using the 3- to 4-inch paintbrush. Allow the primer to dry for about an hour or two.
Repeat steps 5 and 6, except use paint instead of primer.
Ryan Lawrence is a freelance writer based in Boulder, Colorado. He has been writing professionally since 1999. He has 10 years of experience as a professional painting contractor. Lawrence writes for High Class Blogs and Yodle. He has a bachelor's degree in journalism and public relations with a minor in history from the University of Oklahoma.