Rislone 41111 – Permanent Head Gasket & Block Sealer, 680g

Use When You Notice…

• White or sweet-smelling exhaust smoke: Coolant burning in the combustion chamber signals a head gasket breach — this sealer targets exactly that leak point.
• Milky or frothy engine oil: Coolant mixing with oil is a classic bad head gasket symptom; sealing the leak stops further contamination.
• Unexplained coolant loss with no visible external leak: Coolant disappearing internally points to a combustion-side leak the block sealer is formulated to fix.
• Combustion gases detected in the coolant tank: A bubble test or mechanic's combustion-gas test confirming head gasket failure — ideal use case for this product.
• Mechanic-confirmed small coolant passage crack or porosity: Minor structural leaks in the block or cylinder head that do not yet warrant full disassembly.

Key Benefits

• Permanent Chemical Seal: Reacts with combustion heat to form a durable, heat-resistant bond — one treatment, not a recurring top-up.
• Major Cost Saving: Avoids engine overhaul bills of ₹25,000–₹80,000, often exceeding the resale value of older Indian vehicles.
• India Heat Rated: Engineered to withstand temperatures beyond 48°C — protects engine from overheating in Indian summer heat found across Delhi, Nagpur, and Rajasthan.
• Cooling System Safe: Non-clogging formula will not harm radiators, water pumps, or heater cores even in systems stressed by Indian stop-and-go city traffic.
• Genuine USA Origin: Authentic Rislone 41111 — not a grey-market or duplicate import, sold through naredi.in India's authorised channel.

The Technology Inside

Rislone 41111 uses a sodium silicate base combined with fibrous sealing particles engineered to remain suspended in coolant until they reach a leak point. When the mixture contacts combustion-side heat at the breach, a thermally-activated polymerisation reaction occurs, converting the liquid into a rigid, heat-resistant plug that fills the gap from within. This dual-action mechanism — chemical bonding plus physical fibre bridging — is what distinguishes a permanent block sealant from older, purely particulate stop-leaks that simply pack the gap temporarily. The formula is designed to tolerate the thermal cycling caused by India's extreme seasons, from 48°C summer afternoons to monsoon-season cold starts, without cracking or washing out of the sealed joint.

Dosage & Coverage

The entire 680g bottle is a single-use, full-system treatment for one vehicle cooling system — do not split the dose. Add the product following the precise procedure on the bottle: cooling system preparation, correct dilution with distilled water, and a controlled idle and drive heat cycle to activate sealing. Because the sealing reaction depends on reaching specific temperatures, skipping or shortening any step will reduce effectiveness — follow instructions exactly.

Compatibility

Safe to use with

• Water-cooled petrol and diesel engines where coolant circulates freely throughout the system.
• Turbocharged and mild-hybrid engine variants.
• Compatible with Maruti Suzuki, Hyundai, Tata, Honda, and Mahindra cooling systems.
• Works with standard ethylene glycol coolant mixtures.

Not suitable for

• Severe mechanical damage — broken connecting rods, large structural fractures, or badly warped cylinder heads.
• Cooling systems blocked with heavy scale, rust, or old stop-leak debris that prevents free coolant circulation.
• Air-cooled engines or oil-cooled systems with no water jacket.
• Use as a preventive maintenance additive — this is a targeted repair product for confirmed leaks only.

Why It Matters in India

In India, an engine overhaul for a head gasket routinely costs ₹25,000–₹80,000 — often exceeding the market value of a high-mileage Maruti 800, older Tata Indica, or rural commercial vehicle. For taxi drivers, autorickshaw operators, and vehicle owners far from authorised machine shops in Tier-2 and Tier-3 cities, the best head gasket sealer provides a viable, immediate repair path when teardown is not practical. Indian hard water used in radiators accelerates scale and corrosion that weakens gasket sealing surfaces, making early chemical intervention especially valuable. The product is also suited to India's BS6-compliant petrol and diesel engines, which run hotter and at higher combustion pressures than older BS4 units.

How To Use

1. Allow the engine to cool completely, then drain and flush the cooling system of old coolant and debris.
2. Shake the bottle well and pour the entire 680g contents into the coolant reservoir alongside distilled water at the ratio specified on the label.
3. Start the engine and run the specified idle and drive heat cycle — typically 15–20 minutes — so the sealant reaches and reacts at the leak point.
4. Allow the engine to cool fully, confirm the leak has sealed, then replace cooling fluid as recommended.

⚠ Safety Note: Never open the coolant reservoir cap on a hot engine — risk of scalding steam. Use distilled water, not Indian tap water, for the flush and refill to avoid reintroducing hard-water mineral deposits.

Frequently Asked Questions

Is this a temporary or permanent repair?

When applied correctly to a leak that is not severely mechanically damaged, the repair is designed to be durable and long-lasting — not a short-term fix. Many users report the seal holding for years of normal driving, particularly in lower-stress city and highway conditions common to Indian commuter use.

Will it work on my BS6 Maruti, Hyundai, or Tata vehicle?

Yes — Rislone 41111 is compatible with the water-cooled petrol and diesel engines fitted to BS6 vehicles from Maruti Suzuki, Hyundai, Tata, Honda, and Mahindra. BS6 engines run at higher temperatures, which actually assists the heat-activated sealing reaction. Always confirm coolant passages are unblocked before use.

Will this affect my PUC or emission test results?

Once the head gasket leak is sealed, coolant will no longer enter the combustion chamber, which should reduce white smoke and help the vehicle pass PUC emission checks. The sealer itself does not add hydrocarbons or particulates to combustion; it remains in the cooling system side of the engine.

Can I use it as a precaution before a problem appears?

No — Rislone Block Seal is a targeted repair product for confirmed leaks, not a preventive additive. Adding it to a healthy cooling system without a leak serves no purpose and is not recommended by the manufacturer.

Is Cash on Delivery available and how fast is delivery?

Yes, naredi.in offers Cash on Delivery across India with free shipping. Most metro orders (Delhi, Mumbai, Bengaluru, Chennai, Hyderabad) are delivered within 2–4 business days; Tier-2 and Tier-3 cities typically receive orders within 4–7 business days.

Complete Your Kit

For best results, prepare your cooling system before using Block Seal — these companion Rislone products work directly alongside the 41111.

• Rislone Radiator 10 Minute Flush (41211): Clears scale, rust, and old stop-leak debris from Indian hard-water-damaged radiators so the Block Sealer can circulate freely and reach the leak — use this first.

Warranty & Support in India

• Warranty: 1-year warranty against manufacturing defects
• Customer Support: Monday–Saturday, 9 AM–6 PM IST. WhatsApp / Phone: +91 93112 11157 · hello@naredi.in
• Returns: 14-day return and exchange policy, COD returns accepted
• Delivery: Free delivery across India, Cash on Delivery available