Advice please question about adhesive - Tile Advice

[Tomtom]

Hi I am new to this forum . I am looking for some good advice fro experienced tilers .

I have been told I cannot use p9 on ply wood floors because it's a slow set ? And been told I have to use p9 express as it's fast setting ? The tiles are porcelain.
Is this correct ?

Cheers

 

[Flintstone]

That's bad advice. That adhesive is a c2 and not suitable for ply wood. Most professional tilers will not tile direct to ply wood, it's best to use a cement board instead or over the ply