Key Facts

CT 17 "PROFI" deep-penetrating primer

Formulation for surface strengthening of all absorbent substrates


  • for all absorbent substrates
  • strengthens the substrate surface
  • reduces substrate absorbency
  • improves adhesion to the substrate
  • application of tiles on cement and cement-lime substrates after only 15 minutes
  • yellow colour — allows to control work phases
  • vapour permeable
  • very low emission EC1
  • facilitates application of subsequent layers of, e.g.,adhesives, fillers, putties, floors


Ceresit CT 17 Profi is designed for priming substrates (walls, floors, ceilings) inside and outside buildings prior to fixing ceramic tiles, pouring floors, fixing floor lining, papering, puttying, painting, or fixing thermal insulation boards. The primer is solvent-free. Substrates primed with Ceresit CT 17 Profi (all kinds of plaster, concrete, screeds, primers with underfloor heating installations) are of lower absorbency, which prevents too rapid overdrying of adhesive mortars, flooring, putties and paints.

Step By Step

Before applying CT 17, test the load-bearing capacity and strength of the substrate. Clean the surface and remove any dust. CT 17 is ready-to-use and can be applied with a brush or roller.

Related products/ systems