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 Post subject: Re-painting garage doors
PostPosted: Wed Apr 25, 2018 10:38 am 
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Hi,
We are looking to repaint our garage doors which are currently red and would like to paint them a dark grey.
The current paint is peeling. I’m looking for advice as to what I need to do. Do I need to strip the paint first? Or can it be sanded down where it is peeling?
Does it need a primer? General info about the best way to paint the doors?

Many thanks in advance


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PostPosted: Wed Apr 25, 2018 11:11 am 
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:welcomeuhm:

Is the paint peeling from another layerof paint or the surface of the door, as this affects the best course of action. Also, is the door wood or metal?

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PostPosted: Wed Apr 25, 2018 11:48 am 
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So the doors have been painted twice and we can now see the metal underneath. The doors are metal, but I’m not sure what type of metal it is. Does that help?


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PostPosted: Wed Apr 25, 2018 12:33 pm 
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Possibly zinc. Does the bare metal have a powdery feel to it, as un-primed zinc will throw paint off eventually.

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PostPosted: Wed Apr 25, 2018 9:42 pm 
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:hello2: Oh go on. What is the zinc metal thing. Is it the same as galvanised?


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PostPosted: Wed Apr 25, 2018 10:20 pm 
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That’s what I wanted to ask, is Zinc the same as Galvanised metal?


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PostPosted: Thu Apr 26, 2018 6:59 am 
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Essentially it's the same thing. Zinc is a sacrificial metal and untreated will oxidize, forming a powdery layer on the surface which ultimately rejects paint.

OK, what I'd do in this situation.

Scrape any loose paint off
Sand the good paint back to a feather edge. Dust the sanded areas.
Apply mordant solution to the bare metal areas. Have a look herefor more info. It chemically etches the surface and provides grip for the paint system.
Undercoat
Gloss

I think B&Q have mordant solution :thumbright:

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PostPosted: Thu Apr 26, 2018 9:03 am 
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Great thank you for the advice.
What is the best paint to use that will last and keep like new?


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PostPosted: Thu Apr 26, 2018 6:48 pm 
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Zinsser Allcoat is worth a look.


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