Painted concrete floor as a base for tiles?

[larsrydell]

I have a painted concrete floor (the paint is still there!) that I plan to cover with underfloor heating (electric) and tiles. I've asked around a bit and got double advice... Either remove the paint with milling or just prime and self-level the cable.

If anyone has opinions on what is the smartest approach in this situation, I'd appreciate any feedback.

Milling a concrete floor sounds like a fun holiday project, but I think my partner has other plans...

 

[zankan]

Not great to prime and fill on painted concrete. There's a risk that the whole thing will come off when the filler sets. Remove the paint unless you're making a self-supporting floor, but it adds a bit of height...