If as you say it’s a pig to chisel off then it would appear to have stuck well. And I can’t see any issue with tile adhesive not adhering to that rough surface.
For me I’d only be thinking about...
Type: Posts; User: draftsmann
If as you say it’s a pig to chisel off then it would appear to have stuck well. And I can’t see any issue with tile adhesive not adhering to that rough surface.
For me I’d only be thinking about...
Is there a reason not to tile over the render?