Painting Galvanised Garage Door

20 Sep 2014
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United Kingdom
I want to paint my double garage door white. It is galvanised and powder coated white and is looking tired. I am worried about painting it as I painted a white metal security door here last year with white hammerrite. It looked great but within a year has flaked and looks very dirty. This dirt will not clean off.

I dont want this to happen on my garage door so wondered if any decorators had any pro tips. thanks
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