On 20/05/2021 10:28, nightjar wrote:
On 19/05/2021 20:21, Scott wrote:
On Wed, 19 May 2021 19:43:27 +0100, nightjar
wrote:

On 19/05/2021 19:13, Scott wrote:
I am wondering if anyone has tried using Hammerite paint on a plastic
pipe.Â* Mr Google seems to think it is okay.Â* For context, I am
painting a steel fence so it would be very convenient to use the same
paint on the pipe even if it is over-specified but not if it is likely
to cause problems.


Probably depends upon the Hammerite you are using and the plastic the
pipe is made from :-)

IIRC, the original Hammerite used xylene as a solvent. Xylene badly
degrades uPVC, a common material for pipes. However, there are now water
based Hammerite paints, which are unlikely to affect any plastic.

Thanks.Â* I think this is in between, as petroleum based paint, so it
sounds like I should be careful.Â* What is the recommended paint for an
outdoor pipe.Â* (One of my neighbours has put up a white pipe when all
the drains etc are black.)


I have always used oil based household paint without problems. If the
paint has a list of constituents, you can check them for compatibility
with PVC he

https://www.calpaclab.com/pvc-polyvi...ibility-chart/

That is a very useful reference for edge cases. I find that gloss paint
and particularly black paint on south facing pipes flakes off after a
while. Then it is facing into prevailing weather and strong sunshine.

Paint film and PVC don't expand at quite the same rates is my guess.


--
Regards,
Martin Brown