Sikasil® WS-305 S is a premium neutral-curing silicone sealant engineered by Sika for professional-grade weatherproofing on building facades. This one-component weather seal delivers ±50% joint movement capability, bonding tightly to glass, metals, coated and painted metals, plastics, and wood — making it a trusted weatherproofing sealant for window sealing, door sealing, and exterior joints across Pakistan's harsh summers and monsoon seasons. As one of the most dependable chemical products in Sika's construction chemicals range, Sikasil 305 stays flexible for years without cracking, yellowing, or losing adhesion. Buy genuine Sikasil in Pakistan, with nationwide delivery from Ghar Plans — an authorized Sika dealer.