MASTERSEAL 355 

MASTERSEAL 355 is a one component, transparent, penetrating silane/siloxane impregnant.  The product reacts chemically with a mineral substrate to form a surface that is repellent to water yet still permeable to water vapour.  MASTERSEAL 355 protects and preserves the substrate without altering the natural surface texture or colour.

MASTERSEAL 355 is recommended for weatherproofing exterior building brickwork, concrete, cement rendered concrete blocks, natural or cast stone etc.