Scrub off the chalk with a strong solution of water and spic and span or tsp detergent or a nonphosphate tsp alternative.
Painting chalky siding.
It is also important to use a cleaner when powerwashing so that it will actually help remove the chalk along with the pressure.
By the diy experts of the family handyman magazine.
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If your siding is horizontal paint left to right.
If your aluminum siding has developed a chalky residue or is faded stained or just plain the wrong color fear not.
This ensures even coats and will prevent you from missing any spots.
Some exterior paints such as those used on aluminum siding intentionally chalk for self cleaning.
Cover ground and nearby shrubs with drop cloths.
As a rule of thumb paint takes two hours to dry.
This is very important because this is what actually removes the chalk before the primer is put on.
Here s how to prepare the surface and choose your paint.
There are several steps in dealing with a chalky surface to ensure a long lasting paint job.
If vertical paint up to down.
To test the dryness of your paint touch the siding with your finger in an inconspicuous area.
You can paint it.
Test old siding paint for lead using a lead test kit.
If the paint no longer feels tacky or sticky it s completely dried.
Rub siding with cloth to check for powdery paint pigment and mildew.
This oxidation that occurs on aluminum siding results in the build up of a chalk like substance on the siding itself which can easily be seen by wiping your hand across the aluminum.
If the paint color comes off on your hand the paint is chalking.
If lead is present contact a licensed lead abatement specialist.