Traditional construction mastic adhesives and pastes are generally designed for indoor applications and are not fully waterproof, meaning they will break down, dissolve, or lose adhesion if subjected to constant standing water or direct moisture exposure. However, modern waterproofing technology has introduced modified synthetic elastomeric and polyurethane mastics engineered with enhanced moisture resistance for specific tile installations. For areas subject to heavy water exposure like showers or exterior joints, professional contractors always prefer 100 percent waterproof silicone or polyurethane sealants over standard water-based mastics.
1 votes
Marked as accepted