You may want to use rough sandpaper 80 grit and then gradually finish with fine sandpaper 220 grit to even the surface.
Sanding aluminum siding before painting.
The best way to address these issues is to repaint the siding.
If a section has more severe damage you may need to replace it with a new section of aluminum siding.
Required tools for this how to paint aluminum siding project have the necessary tools for this diy project lined up before you start you ll save time and frustration.
Apply self etching primer let dry then sand again.
Then prime the aluminum with an oxidizing primer made specifically for metal which will help inhibit rust from forming in the future.
You want the absolute best adhesion surface for your paint.
Make sure you sand down in only one direction.
Pound in any protruding nail heads.
Apply paint multiple coats and.
As mentioned before 100 percent acrylic latex paint is the best paint to use to paint aluminum siding.
Over time the aluminum siding builds up mildew and can begin to look chalky or the paint color may fade.
Work a paint scraper from every direction keeping the blade flat against the wood so you don t create gouge marks.
Use a scraper to remove loose paint from the siding working from every direction.
2 to 4 hours per 100 square feet of siding before you paint aluminum siding clean the surface thoroughly and prime the siding with one coat of acrylic primer.
Sand down the siding.
Before sanding scrape loose and flaking paint from the siding.
Help the scraped areas blend in by gently sanding the edges.
There are ways to safely clean your house before painting using a pressure washer including using lower psi pressure washers widening the spray and standing at least two feet back.
Sand the metal surface with coarse then fine grit sandpaper.
Potential of siding damage water injected under siding or dirt remaining on house.
There s still more preparation to address before painting aluminum siding.
You need to scrape off peeling and flaking paint and then chisel out any old caulk lines and apply new ones.
Another way to prepare the siding is by sanding it down to clean up the surface.
Then paint with two coats of acrylic paint.
In this video toh expert shares his tips and demonstrates how you clean and prepare the surface for painting.
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If you notice any peeling paint scrape it away to make the siding smooth.