On 22/05/2020 10:37, Scott wrote:
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:-)

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