Poor surface preparation results in poor paint adhesion and is the cause of 80 percent of all coating failures according the the sherwin.
Prepping siding for paint with garden hose.
As long as the siding is clean you won t need to use a primer unless raw metal is exposed.
Do not spray upward under siding or into air vents near the eaves which permit air circulation into the attic.
Dried mud spiderwebs bird nests vacated wasp nests etc.
Connect garden hose to pressure washer and attach a fan spray tip to the washer s wand.
A concentrated stream can damage wood seep under lapped siding and break windows.
Some of the preparation guidelines include.
If you used tsp to clean the house rinse twice to ensure the solution is completely gone.
Use caution when selecting the nozzle.
It s possible to prep the surface using just scrub brushes detergent and a garden hose.
A pressure washer with the proper detergent is the most efficient way to thoroughly cleaning exterior siding.
With the siding dry remove large pieces of debris with the wire brush broom and even a shop vacuum.
Painting aluminum siding faqs how long does paint last on aluminum siding.
Finally since metal is such a good heat absorber avoid painting siding while it s getting direct sunlight.
Lightly sand glossy finishes to remove the sheen called scuff sanding but sand scrape or cut into the surface only as much as is necessary to correct problems.
After washing the building should be allowed to dry thoroughly.
Be thorough as new paint won t adhere well to dirt mildew or failing paint.
When you re done rinse the siding with clean water.
Rinse the entire house with a garden hose until the runoff water is clear.
Fill the washer s reservoir with bleach tsp water cleaning solution.
Using a hose a pump sprayer and a scrub brush is slower but safer and just as effective.
Use a 300 degree steam cleaner a rental item or scrub the siding with a very hot detergent solution.
Aluminum siding paint typically lasts from five to 10 years and.
Let the siding and trim dry completely usually two days before painting.
How to prepare t111 rough plywood siding for repainting.
On surfaces that aren t suffering from excessive peeling or flaking a regular garden hose and scrub brush will work.