Can wall tile adhesive be used on wall prep with polyfilla?

Wall tile adhesive is generally designed for use on surfaces that are clean, dry, and suitable for tiling, such as plasterboard or cement backer board. If polyfilla has been used to prepare the wall, it should be fully cured and sanded smooth before applying tile adhesive. However, it’s essential to check the adhesive manufacturer's guidelines, as some adhesives may not bond well to materials like polyfilla. For best results, consider using a primer or an adhesive specifically formulated for use over filled surfaces.