Well for that length of time I suspect the only thing that would work is one
of these professionally applied coatings. I'm not in an exposed area, but
this wallcoat stuff if done right seems to be very good. Not cheap but at
least to me only having two walls, cost effective.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Harold Davis" wrote in message
...
Hello,

I need to paint the concrete window sills and the window surrounds on my
roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
Scotland. They're painted at the moment but haven't been maintained for
some
years. The sills I think have been done with some kind of matt external
paint
and are crumbling but only very slightly and on the surface and not
sufficiently to require skimming. The surrounds have been done with
something
more glossy.

The guy in the paintshop recommended a 3:1 water:PVA coat after scraping,
and
then some Dulux Weathershield. He didn't seem to know much about SBR or
alternatives to that brand and type of paint.

Should I use PVA or SBR or something else? I thought for a while that
maybe
he's right at least on the PVA score because a decent paint will soak into
the
concrete which SBR being waterproof would hinder. I'd be grateful for
advice
from some of the knowledgeable people here.

And what should I do about the surrounds?

Third question... The walls are roughcast and look mostly okay for the
time
being although in places they are weather-stained and I plan to paint
them. I
was thinking one coat of SBR followed by two coats of masonry paint. Does
that
sound okay? Or would it amount to putting a vapour barrier on the cold
side of
insulation and thereby muck up the ventilation something rotten? I'd like
to
use paint that doesn't need to be recoated in the next 20-30 years.

Thanks in advance,

Harry