Preparation of the substrate
Which TOUPRET filler to use for leveling the surface of an exterior wall made of various materials and locally covered with paint?
First of all, you have to make sure that the paint on the substrate is not a waterproof soft coating. This kind of coating cannot be covered by any filler and requires to be stripped beforehand. If not, after scratching non-cohesive areas and checking the moisture rate of your substrate, you can apply Murex or Fibarex to fill holes, cracks and various gaps. Once your local filling works are dry, and in order to enable you achieve a satisfactory evenness of the wall, you can apply Fibarex or Planirex into an overall coat, up to 5mm. Once these operations have been carried out and once the filler overcoats are dry, then you can apply the finishing coat.
Which filler would you recommend to treat damp walls?
HUMIBLOCK is treatment filler dedicated to interior of exterior damp masonry. It applies on raw substrates, either into light coats by brush or into thick coats with a trowel or a blade. It enables to level the irregularities. It applies into a crisscross pattern. Whatever the application tools (brush or trowel or blade) a coat thickness of minimum 2 mm is required. HUMIBLOCK only applies on raw and non-dripping substrates [refer to the technical datasheet]. It will stand as a barrier against the residual water contained in your substrate while enabling the water vapour evaporation thanks to its high water vapour permeability. This is the reason why it is absolutely necessary to ensure that the over coating paint should be water vapour permeable too.