The cause of paint peeling from galvanized metal is failure to do sufficient preparation.
Painting galvanized gutters vinegar.
The acidity of the vinegar will react with the metal treating the surface to promote paint adhesion.
Wipe the galvanized surface down with white vinegar.
Clean new galvanized metal surfaces with a water based cleaner degreaser to remove any oil or and contaminants.
The acid in the vinegar will act to etch the metal and help the paint adhere.
All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface.
The acids in the vinegar will etch the metal in preparation for painting.
Apply two topcoats of paint on top of the primer.
As a roofer who has to bond adhesives and hot ashpalt to galvanized quite frequently i can tell you that galvanized is not clean.
Here s how to redo the job right.
If you have galvanized gutters and downspouts iron or steel with a thin coating of zinc here are steps you should follow to get a paint job that lasts.
Rub the gutter with a firm amount of pressure to remove oil specks and other substances which could make painting tricky.
While vinyl gutters do not require painting aluminum and steel gutters benefit from a fresh coat of paint.
In many cases that means painting the gutters and downspouts particularly if they are badly weathered or suffering from an earlier paint job that has seen better days.
Outdoor gutters fade in time.
It s recommended to whipe it down with vinegar to get the gutter perfectly clean.
The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick.
Prime the surface with a primer made for metal.
Allow the galvanized gutters to dry and do the same thing with a little vinegar.
With older gutters that may have a little mold on them we usually scrub them with a bleach water solution.
Watch this video to find out more.
Once the metal has dried dampen a cloth with white vinegar and wipe the surface down.