PVA. Tile primer

[Phill22]

hi
I have just read a post that stated not to use pva as a tile primer.
Ouch, I read it to late.
I removed the old tiles from my bathroom and re plastered the holes and patched up areas. I then applied a coat of pva mix of 3/1
I don't want my tiles to fall off in 6 month, please could someone suggest what I can do to make sure I get a good adhesion.

Many thanks

 

[Phill22]

Tile center suggested 2 coats of Bal SBR 1-2parts ratio.

Which I am going to do later.
Does anyone know if I can add SBR to my cement based adhesive.?

Thanks