CRC 8498 Leak Stop Spray Seal 350g

CRC Leak Stop Spray Seal is a spray-on, synthetic rubber leak seal in a 350 g aerosol. CRC states it provides a waterproof seal, bridges gaps and cracks, and is flexible, durable and long lasting. It dries translucent.

CRC lists it for gutters, skylights, chimney connections, ventilation pipes, ducts, sheet-metal covers, bitumen, vents, flashings, monolithic and plastered surfaces and downpipes. It is for hard surfaces and is not recommended for use on fabrics.

Where this product is used

• Gutters, downpipes and skylights
• Chimney connections, vents and flashings
• Ventilation pipes, ducts and sheet-metal covers
• Bitumen, monolithic and plastered surfaces
• General waterproofing of hard surfaces

Features

• Synthetic rubber base that cures by evaporation
• Bridges gaps and cracks; wider gaps and cracks need multiple applications
• Flexible, durable and long lasting, per CRC
• Translucent once fully cured
• Can be coated with any paint finish to improve the longevity of the seal, per CRC
• 360 degree spray system works at any angle
• Temperature resistance of -25 °C to 100 °C

Key specifications

Selecting the right option

This is a spray-on seal for external and hard surfaces. For a bead sealant see CRC RTV Silicone Select-A-Bead Sealant, and to find a gas or air leak before sealing see CRC Leak Detector Water Based 510g.

Using it

Remove dirt, debris, loose rust and any pooled water from the surface. Mask surrounding areas if required.

Shake until the agitator ball moves freely, then for at least one further minute.

Spray 10-20 cm from the surface in a smooth, even coating. Allow 15 min before subsequent coats, and repeat until a thick seal is built up.

Wider gaps and cracks need multiple applications.

Wipe the nozzle clean after use. If it clogs, remove the button and clean the slot and orifice with wire.

Storage and handling

See the safety data sheet for handling and storage advice. The can is a pressurised container.

Limits and safety

Signal word: Danger. Dangerous goods UN 1950, Aerosols, Class 2.1. Extremely flammable aerosol. Pressurised container: may burst if heated. Causes skin irritation and serious eye irritation. May cause respiratory irritation, drowsiness or dizziness. Suspected of causing cancer. May damage fertility or the unborn child. May cause damage to organs through prolonged or repeated exposure. Toxic to aquatic life with long lasting effects. The safety data sheet also lists AUH066. Contains toluene and methyl isobutyl ketone. CRC does not recommend it for use on fabrics. Read the safety data sheet before use.

Frequently asked questions

What temperature can CRC Leak Stop Spray Seal withstand?

CRC's technical data sheet gives a temperature resistance of -25 °C to 100 °C.

How long until CRC Leak Stop Spray Seal is touch dry?

CRC gives touch dry in 15-30 min, and says to allow 15 min between coats. The technical data sheet gives no full cure time.

Can I paint over it?

Yes. CRC states the longevity of the seal can be improved by coating it with any paint finish.

Is it safe to use without precautions?

No. CRC's safety data sheet carries the signal word Danger, including suspected of causing cancer and may damage fertility or the unborn child. Read it before use.

Is it a dangerous good?

Yes, as an aerosol: UN 1950, Class 2.1, with no packing group allocated (CRC safety data sheet 26/03/25, revision 1.4).

Can it be used on fabrics?

CRC does not recommend it for use on fabrics. It is listed for hard surfaces.

Related products

See also: CRC RTV Silicone Select-A-Bead Sealant, CRC ADOS MS High Performance Adhesive Sealant, CRC Clear Urethane Seal Coat - Protectant 300g, CRC Leak Detector Water Based 510g, CRC HVAC Leak Detector Aerosol 1752429 - 510g.