Sika SikaTop-540 Seal

SikaTop 540 — High-Elasticity Drinking Water Grade Waterproofing Slurry

SikaTop-540 Seal (formerly MSeal 540) is a two-component, pre-proportioned waterproofing slurry system comprising a liquid polymer (Part A) and pre-blended powder (Part B). When mixed, they produce a smooth, brush-applied waterproofing slurry that bonds excellently to various building substrates. This polymer-modified slurry, based on selected synthetic resins and cement, provides enhanced adhesion while allowing water vapour transmission to prevent internal moisture accumulation. The product is certified for drinking water safety and passes fire resistance testing.

SikaTop 540 Features

• Two-component pre-proportioned system (liquid polymer + powder), consistent quality
• Polymer-modified for improved adhesion to multiple substrates
• High elasticity, bridges fine cracks, accommodates minor structural movement
• Good breathability (allows water vapour transmission), prevents moisture build-up, reduces long-term maintenance
• Durable and weather-resistant, suitable for exposed application
• Easy to apply by brush or spray
• Drinking water safe — certified for potable water contact
• Passes fire resistance testing
• Very low VOC content

Applications

• Potable Water Waterproofing — drinking water tanks, reservoirs, cistern interiors
• External Walls — concrete, masonry and other substrate exterior waterproofing
• Terraces & Balconies — terrace, balcony, kitchen and bathroom sub-floor waterproofing
• Planters & Tanks — planters, sumps, water tanks interior waterproofing
• Bridge Decks — bridge and flyover deck rain penetration protection
• Buildings with minor structural movement
• Projects requiring breathable substrate protection without moisture entrapment

Why Choose SikaTop 540?

• Drinking water grade: One of few waterproofing slurries certified for potable water contact
• Breathable: Allows water vapour transmission, prevents internal moisture build-up
• High elasticity: Bridges fine cracks, accommodates minor building movement
• Exposed use: Can be left exposed without additional protective layer
• Fire rated: Passes fire resistance testing

Packaging

Kit (Part A liquid in plastic container + Part B powder in paper bag)

SikaTop 540 vs SikaTop 107

Important Notes

• Substrate must be clean, sound, free from laitance, loose particles, grease and old coatings
• Substrate must be thoroughly saturated with water before application
• Mix using mechanical stirrer (slow-speed drill with paddle), mix until uniform and lump-free
• Protect fresh coatings from direct sun, high temperatures and wind to prevent rapid drying
• Cure using damp hessian, polyethylene film or Sika Antisol S curing compound
• Freezing will destroy the product — prevent freezing during storage
• Clean tools with water before resin hardens

For detailed application methods, coverage rates and technical parameters, please refer to the official product data sheet.