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stevewool

hammerite paint

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17 minutes ago, jimeve said:

I would use.... Zinc Chromate Primer. Red oxide is for iron. I foolishly used red oxide on my car port and is now peeling. I should have known better being a painter n decorator for 40 odd years:bonk:

Thanks Jim , Emma was about to get me painting these before they are up, now it may have to wait for weeks or years ., 

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2 hours ago, stevewool said:

Thanks Jim , Emma was about to get me painting these before they are up, now it may have to wait for weeks or years ., 

It's usual to let the galvanised sheets weather before painting, maybe next year.

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3 hours ago, jimeve said:

I would use.... Zinc Chromate Primer. Red oxide is for iron. I foolishly used red oxide on my car port and is now peeling. I should have known better being a painter n decorator for 40 odd years:bonk:

I may very well be wrong about this, but I thought that anything galvanized needed to be treated with something like an acid in order to make it accept painted on coatings? This is what I was told when inquiring about painting a galvanized anchor some years ago. Was I given inaccurate advise? It did do what was suggested - I forget what acid I used, but applied that and then copious water to rinse it clean. The paint adhered quite well...

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4 hours ago, Tommy T. said:

I may very well be wrong about this, but I thought that anything galvanized needed to be treated with something like an acid in order to make it accept painted on coatings? This is what I was told when inquiring about painting a galvanized anchor some years ago. Was I given inaccurate advise? It did do what was suggested - I forget what acid I used, but applied that and then copious water to rinse it clean. The paint adhered quite well...

Indeed Tommy it's called etching, You can use vinegar or use weak acid you can buy this acid at a decent hardware store. But using Chromate on tin roofs will be sufficient.

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