which ady

[spudgun]

doing a small bathroom next week with a mix of walls i wall i will be tiling over existing tiles which are well stuck and pretty true,one wall is painted plaster ,before you all start i have read every thread about tiling on painted surfaces, the paint is well stuck and i awill be keying the surface if i had my way i would be over boarding but customer not willing as new sink and toilet already fitted to this wall, the other wall will be over boarded with plaster board,its painted paramount board at min, so was wondring what would be the best ady to use for all surfaces or to use different products to get best results , customer doesnt want to go to the trouble of removing old tiles due to the para board underneath ,ps tiles are 25 x33 cm

[garretridge]

tiling onto tiles score the surface if there shinny and sugar soap to clean them prime any plasterboard leave to dry and use cement based addy on all walls!