Painting galvanized metal roof

Joined
25 May 2021
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Ireland
Hi all

I have a large garage roofed with corrugated galvanized metal sheets with four plastic corrugated roof lights.

As some of the metal sheets were showing rust, I had it painted about four years ago. Following a power wash the painter used a coat of ZINNSER 1-2-3 primer followed by two coats of grey Johnstone Agricultural Oxide.

The grey paint has faded considerably over the four years and the rust has reappeared. (the plastic sheets have fared better with no chipping or wear other than fading)

i am about to have the roof repainted and am looking for advice as to what materials to use. As rust is showing, should it be re-primed. If so which primer would be best? I would also like to get your advice as to which brand/type of paint to use as a top coat (and do I need two coats?)

Any other relevant advice would be appreciated

Thanks in advance

Martin
 
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