Water based undercoat over aluminium primer

[Crf79]

Hi,

I'm currently repainting my front door. I've stripped a the paint and have applied Dulux alumnium primer. I have then added a coat of Dulux primer & undercoat for multi surfaces. However when painting it on, it kind of seperated. Going over it a few times with the brush seemed to fix it. However now I'm worried it's going to start flaking over time. Do you think this will happen? Thank you!

 

[JohnD]

aluminium primer is excellent stuff, and very durable. However it does dry fairly shiny. I think you would do better with an oil-based white undercoat, especially if it is outdoors. If you have used white acrylic primer undercoat, it is quite soft when new, easy to apply and dries fast with little smell, so fine indoors.

You can try wiping it gently with an extra-fine sandpaper to take the shine off.

 

[ic1927]

You should never ever put a water based undercoat over aluminium primer, it must be oil based.

 

[Crf79]

Thanks both.

What is the reason for not doing it- wil it flake?

Do you have any ideas on what I should do now?

Thanks!

 

[ic1927]

The reasons for not using water based undercoat is because the aluminium will bleed through and there can be adhesion issues. Sand it back and use an oil based undercoat.