The SILOSILAN DL ready-to-use product must not be diluted. The SILOSILAN DL active base product must be diluted in a ratio of 1 litre of product in 10 litres of water based on the absorbency of the material to be treated. As a pre-grout: We recommend using the SILOSILAN DL product as a pre-treatment for sealant dirt on all highly absorbent surfaces; apply a coat of product evenly by spray or brush over the entire surface; after 48-72 hours it will be possible to grout, avoiding “burns” and halving the processing times. As a pre-treatment: Before the initial washing on surfaces of hand-made terracotta, Spanish terracotta, Mediterranean terracotta, Provencal terracotta or any highly absorbent terracotta or terracotta, it is advisable to sweep the surfaces well, wet them with water (i.e. dampen them) and then apply a generous coat of SILOSILAN DL. After 24-48 hours, good in-depth water-repellency, anti-saltpetre, anti-mold, anti-efflorescence will be achieved and the surface is ready to receive washing with the acid-based product (SANNY KAL). On exposed brickwork, apply the SILOSILAN DL product in two coats spaced 2-3 hours apart, avoiding any dripping. SILOSILAN DL has a high resistance to acid rain and atmospheric agents and a hydrophobic capacity of approximately 8-10 years and does not change the chromatic appearance of the treated surfaces. SILOSILAN DL can be applied by spraying or with a short-haired roller.