Potassium Methylsiliconate Potassium Methylsiliconate is a waterproofing agent added to paints, coatings and surface treatments. It is ideal for use as a water repellent on masonry surfaces. Bisley supplies both 40% and 50% solutions. Quick Contact ---Your Region---Australia / New ZealandIndonesiaThailandMalaysiaVietnamSingaporeTurkeyMiddle East & IndiaNorth AmericaAll Other Countries Send Product TDS Sign me up for the newsletter! Enquire Now