AlexW wrote:
Looking at http://www.protectacoat.co.uk/ this looks like a render
system in any case which means they may actually remove render rather
than just covering it.

Why do you say that? I have looked, and can't find any info. on what
their product is. I remember the salesman demonstrating his model, and
saying that any defective would be replaced before the "Protectacoat"
was applied, but not that it was a render in itself.