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PostPosted: Sun Jun 18, 2017 5:30 am 
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I have read the paint section and watched the painting videos. But I still need some advice....

I want to re-paint my galvanised steel garage door and iron front gate. Both are metal, with faded and matted and part peeling blue paint, revealing a black paint layer beneath.

My first colour choice would be white. Second choice is black. I like a smooth gloss finish.

My questions are:

1. How should I prepare the surfaces for re-painting? I'm not sure about the galvanised advice in your video, as it won't be bare metal first painting. Can I just knife off the flaky paint and sand down the rest of non-flaky areas to ensure the new paint will adhere?

2. What paint should I use? Is it worth spending all that money on specialist metal paint, like Hammerite, if this new paint layer is not in contact with bare metal but simply covering a previous paint layer? Also, if I go for white, which paint guarantees to be non-yellowing over time?

3. Can I use the same paint on the metal garden gate as on the galvanised garage door? I don't like to be left with lots of started pots of paint to store, it's wasteful.

4. Should I use a brush or roller?

5. What kind of shop should I buy at? I have the two big DIY sheds nearby but notice the professional decorators go to Dulux paint shops or Screwfix.

6. Finally, apart from dry weather, what else matters? Is it best to avoid the current heatwave, as paint may dry too fast or evaporate?

Advice on all or any of the above much appreciated. :-)


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PostPosted: Sun Jun 18, 2017 4:54 pm 
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Rab wrote:
1. How should I prepare the surfaces for re-painting? I'm not sure about the galvanised advice in your video, as it won't be bare metal first painting. Can I just knife off the flaky paint and sand down the rest of non-flaky areas to ensure the new paint will adhere?

If you have bare galvanised metal showing then you either need a mordant solution or T wash or a paint that claims it will stick. Scrape flaky paint, sand with fine paper paint to remove the sheen, then feather the edges where paint has flaked as much as possible if you want a smooth finish.

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2. What paint should I use? Is it worth spending all that money on specialist metal paint, like Hammerite, if this new paint layer is not in contact with bare metal but simply covering a previous paint layer? Also, if I go for white, which paint guarantees to be non-yellowing over time?
Hammerite no longer has a good name. Oil based paint externally, in light, will not visibly yellow. I am not suggesting a paint.

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3. Can I use the same paint on the metal garden gate as on the galvanised garage door? I don't like to be left with lots of started pots of paint to store, it's wasteful.
Yes.

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4. Should I use a brush or roller?
Can't say.

Quote:
5. What kind of shop should I buy at? I have the two big DIY sheds nearby but notice the professional decorators go to Dulux paint shops or Screwfix.
There are also independents selling "trade" paints, as well as Johnstone's and Crown. When you know what paint to use the where will become easier.

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6. Finally, apart from dry weather, what else matters? Is it best to avoid the current heatwave, as paint may dry too fast or evaporate?
Use the heatwave to prepare the surfaces and by then summer will be over. Cooler and not windy would be ideal.[/quote]

As a DIYer and if I wanted a gloss finish I would use a straightforward exterior oil based undercoat and gloss and probably Sandtex (trade). Given your mentions of galvanised there is also Bedec MSP but as I found out from experience and from here do not use the Satin version as it has the opacity of yogurt.

There are also water based paints but as I don't have a clue I stop at this point.



For this message the author OchAye has received gratitude : Rab
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PostPosted: Mon Jun 19, 2017 8:07 am 
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Given your mentions of galvanised there is also Bedec MSP but as I found out from experience and from here do not use the Satin version as it has the opacity of yogurt.


I agree about the Bedec.

Last year I painted a metal garage door that was peeling quite badly. Paint stripper didn't do much so I cleaned that off and used an orbital sander to clean the door up as much as possible. Then I used Metalshield quick-drying primer and then two coats of Metalshield quick-drying satin. Both paints were very easy to apply the the garage door looks great.


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