About Sika SikaTop-107 Seal Plus IN

SikaTop-107 Seal Plus IN is Sika India’s workhorse cementitious waterproofing coating for structures that hold or resist water. It arrives as a pre-batched kit: a milky-white acrylic polymer emulsion (Part A) and a grey powder of Portland cement, selected aggregates and additives (Part B). Mixed on site at a fixed 1:2.5 ratio by weight, the two combine into a cement-grey slurry that you brush, squeegee or trowel straight onto concrete and masonry. Because the polymer liquid already carries the water the mix needs, no extra water is added, which keeps the film dense and consistent from one batch to the next.

What sets this grade apart for Indian projects is its dual credential set. It is tested and certified by the Central Food Technological Research Institute (CFTRI), Mysore as safe for contact with drinking water, and it also clears USFDA Method 175:300 for both single and repeated potable-water contact. That makes it a straightforward specification for overhead tanks, underground reservoirs and treated-water sumps, where many general-purpose coatings cannot be used. The same coating handles the everyday waterproofing that consultants and contractors deal with daily: leaking terraces, damp basement walls, wet toilets and kitchens, swimming pools, planter boxes and drains. It bonds to damp substrates, stays flexible enough to bridge hairline cracks, and protects the concrete underneath from chloride ingress, carbonation and saltpetre action.

The technical insight

The performance comes from polymer modification. Ordinary cement slurry is rigid and porous, so it cracks and lets water creep through capillaries. Here, the acrylic emulsion coalesces into a continuous polymer film that laces through the hydrating cement matrix. That film does three things at once: it fills and blocks the capillary pores that water would otherwise travel along, it adds elasticity so the coating flexes with minor substrate movement instead of fracturing, and it dramatically improves adhesion to damp concrete. The result is measurable, tested to BS EN 12390-8, the cured coating shows roughly zero water penetration at 5 bar pressure held for 72 hours, which is why it works against both positive-side head and, on sound substrates, negative-side dampness. The elastomeric character shows up as about 110% elongation at break with a Shore A hardness near 90, giving a film that is tough enough for foot traffic yet stretchy enough to span the fine, static cracks typical of settled concrete. It is important to read that flexibility correctly: it bridges hairline and fine static cracks, not live, moving joints, which need a dedicated joint sealant rather than a coating.

Where it is used

• Waterproofing potable-water reservoirs, overhead tanks and treated-water sumps where CFTRI/USFDA drinking-water certification is mandatory
• Lining raw-water tanks, wastewater tanks, canals, fountains and swimming pools on the water-retaining face
• Terrace, balcony, sunshade and small-roof waterproofing before protective screed or tiling
• Internal and external damp-proofing of basement and retaining walls against ground moisture
• Wet-area waterproofing in toilets, kitchens, utilities and sunk slabs, often under SikaCeram tiling
• Lift pits, sumps, RCC gutters, drains and planter boxes exposed to standing or running water
• Pore and blowhole filling and sealing of fine static cracks in non-moving concrete
• Protective coating on concrete against chloride penetration, carbonation and freeze-thaw or de-icing-salt attack

Key advantages

• CFTRI and USFDA 175:300 certified for contact with drinking water, single or repeated use
• Two-sided protection, resists positive water pressure and, on sound concrete, negative-side dampness
• Pre-batched kit with no water to add on site, giving consistent film quality batch to batch
• Bonds well to damp substrates, so surfaces do not need to be bone-dry before coating
• Flexible film bridges hairline and fine static cracks while staying tough underfoot
• Blocks chloride ingress and carbonation and is non-corrosive to embedded steel
• Applies easily by brush, squeegee or flat trowel with a fast ~6 hour recoat and quick curing
• Can be reinforced with Sika Fabric-50 between coats for demanding or large-area work

Limitations & considerations

• Bridges only hairline and fine static cracks, it is not designed for live, moving or structural cracks and expansion joints
• Short ~45 minute pot life at +27 C, so only mix the quantity that can be used within that window
• Must be applied between +10 C and +40 C, and not in direct sun or strong wind
• Do not add water under any circumstances, doing so weakens the film
• Freshly applied coating must not be ponded or subjected to water immersion before 7 days of curing
• May show temporary surface blooming after rain or in damp weather, though this does not affect performance

Selection & best practice

Specifications

Industry use cases

How we position Sika SikaTop-107 Seal Plus IN

SikaTop-107 Seal Plus IN sits in the middle of Sika’s cementitious waterproofing range and is the default choice when drinking-water certification matters. Within the same Sika family, step up to SikaTop-107 Seal Plus Ultra for higher-flexibility, more demanding waterproofing, pair it with Sika Fabric-50 as between-coat reinforcement on large or high-risk areas, and detail junctions and penetrations with SikaSwell S-2 hydrophilic sealant, Sikagard 694F epoxy putty and Sika SealTape F alongside SikaCeram tile adhesives in wet rooms. Across our other brands we can offer directly comparable acrylic-cementitious coatings, including Dr. Fixit’s Fastflex/Roofseal grades and MC-Bauchemie systems, so specifiers can match brand preference, approval requirements and budget. Space Arc supplies and applies all of these across Delhi NCR and Pan-India.

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