Advice about painting

I have noticed some of the paint on the outside of my window frames is starting to blister. I remember when the windows were installed they made a thing using about using microporous paint.
Does this mean I need to use microporous paint again?
If so, can I buy microporous primer, and is this needed?
Could or should I just rub it down a bit and use exterior paint?
Is water-based paint any good for outdoor use these days or should I be looking for oil-based paint?
Could I use the paint Network Rail used on the Forth Bridge :-)
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On Fri, 22 May 2020 10:37:31 +0100, Scott

You don't have to but it might be a good idea (less chance of a reaction and provide good / breathable protection).

Probably but no.

No, if you are going to use a non-porous paint you might need to go though the std staged or use a good one coat solution.

Depends if you want breathable or not.
It may well be that they were originally painted with a Sadolin product:
https://www.sadolin.co.uk/?s=Sadolin+Superdec

If you want it to look like a rail bridge. ;-)
Our front picket fence is painted with white Superdec and has only been painted twice in over 20 years. The last time it was by daughter and she found it very easy to prep for and paint. Being water soluble is also good for cleanup and the environment.
Unlike gloss paint, it goes on very easily and is less fussy re brushstrokes etc.
Cheers, T i m
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On 22/05/2020 10:37, Scott wrote:

Everywhere it has blistered you need to get down to bare wood again, then get it dry. Smooth and use a proper exterior primer, then an undercoat, then a couple of topcoats and it'll be alright for a good few years.
If you paint over the top of the blisters they'll just keep getting bigger.
Andy
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On Friday, 22 May 2020 10:37:35 UTC+1, Scott wrote:

'microporous' is an irrelevance.

remove anyhting loose with a scraper, rubbing alone won't get it all off. Then sand lightly.

Oil based

Metals want hard paint. Wood wants flexible paint.
NT
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