Hi I am trying to choose a paint to use on exterior concrete window sills that can be RAL colour coded. I have previously tried some and they are getting discoloured when water sits on it for too long, can you advise a decent product that fits my requirements?
Assuming the concrete window sills are clean, dry and sound we can recommend Teamac Chlorvar Chlorinated Rubber for this application.
On concrete a primer coat must be applied with 10% Chlorvar thinners.
This is available in many RAL and BS colours.