J-B Weld Silicone Gasket Maker & Sealant – RTV Automotive Gasket Sealant

J-B Weld Silicone Gasket Maker & Sealant is a RTV (Room Temperature Vulcanizing) silicone gasketing material designed for creating seals in mechanical assemblies and for sealing and bonding uneven mating surfaces. It provides a practical solution for automotive, workshop and mechanical applications where a flexible, waterproof gasket or seal is required.

The RTV silicone cures when exposed to moisture naturally present in the air. Once cured, it forms a tough, flexible and waterproof seal on most compatible surfaces, helping prevent moisture penetration while maintaining flexibility between joined components.

Unlike rigid gasket materials, J-B Weld Silicone Gasket Maker can conform to uneven or irregular surfaces, helping fill small surface variations and create a continuous seal between compatible mechanical components.

Once properly cured, the silicone is designed not to shrink or crack, helping maintain a durable seal over time. It also provides resistance to weathering, making it suitable for a variety of demanding repair and maintenance applications.

The formulation is sensor safe and is suitable for many automotive applications where RTV silicone gasketing material is specified.

For anyone searching for an RTV gasket maker, automotive silicone gasket sealant, flexible gasket material or silicone for sealing uneven mechanical surfaces, J-B Weld Silicone Gasket Maker & Sealant provides a versatile solution for creating and repairing suitable gaskets and seals.

Key Benefits

• RTV silicone gasket maker and sealant

• Designed for mechanical assemblies

• Suitable for gasket-making applications

• Ideal for sealing uneven mating surfaces

• Can be used for both sealing and bonding

• Conforms to irregular surfaces

• Helps fill small surface variations between components

• Forms a tough seal once cured

• Creates a waterproof seal

• Remains flexible after curing

• Will not shrink

• Designed not to crack

• Resistant to weathering

• Sensor-safe formulation

• Suitable for many automotive applications

• Useful for workshop and mechanical repairs

• Cures through exposure to moisture in the air

• Suitable for most compatible surfaces

How to Use

• Ensure the mechanical components are switched off, safe to work on and cool before beginning the repair.

• Remove old gasket material, silicone, oil, grease, dirt and other contaminants from the mating surfaces.

• Make sure the surfaces are suitably prepared for good adhesion.

• Apply J-B Weld Silicone Gasket Maker & Sealant in a continuous bead around the required gasket or sealing area.

• Ensure the silicone is applied around the necessary mating surfaces and openings as required for the specific assembly.

• For uneven surfaces, apply sufficient material to create a continuous seal between the mating components.

• Assemble the components according to the equipment or vehicle manufacturer's instructions.

• Remove excess uncured silicone where necessary.

• Allow the RTV silicone to cure according to the product instructions before placing the assembly back into service.

• Do not subject the seal to demanding operating conditions until it has properly cured.

• Always follow the product instructions and the equipment or vehicle manufacturer's requirements for the specific application.

Typical Applications

• Mechanical assemblies

• Automotive repairs

• Automotive gasket replacement

• Formed-in-place gaskets

• Uneven mating surfaces

• Flexible mechanical seals

• Workshop repairs

• Mechanical maintenance

• Waterproof gasket applications

• Bonding compatible uneven surfaces

• General gasket-making applications

Product Information

Brand: J-B Weld
Product: Silicone Gasket Maker & Sealant
Type: RTV silicone gasketing material
RTV: Room Temperature Vulcanizing
Primary Functions: Gasket making, sealing & bonding
Curing Method: Exposure to moisture in the air
Waterproof When Cured: Yes
Flexible: Yes
Shrink Resistant: Yes
Crack Resistant: Yes
Weather Resistant: Yes
Sensor Safe: Yes
Suitable For Uneven Surfaces: Yes
Applications: Automotive & mechanical assemblies
Primary Use: Creating flexible waterproof gaskets and seals

Data Sheets:
Data Sheet
Data Sheet
Data Sheet
Data Sheet

WEEE Recycling Producer Registration Number:12889

How do I return my old product to be recycled?

You can return your old product to MyDIY. Waste Electrical and Electronic Equipment (WEEE) is taken back free of charge on a one-for-one, like-for-like basis. Waste batteries including rechargeable batteries are taken back free of charge. You are not obliged to make any purchase when returning old batteries. Each local authority must also accept household WEEE and small batteries free of charge at its recycling facilities. All WEEE and waste batteries must be recycled and should not be placed in any of your household wheelie bins. Make sure you always recycle all your old electrical goods and batteries.

What products can I recycle for free?

You can return anything that is electricaly powered or battery powered. Even your old bicycle lamps can be recycled!.

Do you take back used batteries?

Yes we do. The batteries that we accept are AA, AAA, C or D, powertool batterys and also the flat batteries that are found in watches and toys. Unfortunately we do not accept back any Industrial or car batteries.

Do I need to have made a purchase at MyDIY.ie?

No you don't. You can recycle any of the above items at our store in Inchicore Dublin 8, even if you have not made a purchase with us.

Will you collect my old product?

Yes, but we must be notafied within 14 days of purchase date. You can still arrange to have your old appliance recycled free of charge. Simply bring it back to our Inchicore store and we will ensure that it is disposed of in an environmentally friendly manner.

How much will it cost?

There is no charge to return products to any of our warehouses.

Why should I recycle with MyDIY?

We will ensure that your old product is disposed of correctly to reduce the potentially harmful effects caused on the environment and to conserve natural resources. Further information can be found on weeeireland.ie.

EMC (Environmental Management Cost) Included in the purchase price. 

Gas discharge lamps, LFLs and CFLs €0.15

LED lamps and luminaires €0.05

Large appliances €5.00

Information

Fast & Reliable Shipping with DPD

We ship all orders via DPD, one of Ireland’s most trusted couriers. With DPD’s one-hour delivery window, you won’t have to wait around all day for your MyDIY.ie order!

Delivery Times

Each product on our website is marked with an estimated delivery time. If you order multiple items, your order will arrive based on the item with the longest delivery time. For example, if you buy two next-day items and one 3-day item, the entire order will arrive in 3 days.

While most products arrive in 1-2 days, we offer over 44,000 items, so please allow 4-5 working days for some deliveries. Need it faster? Call us at 01-446692, and we'll do our best to help.

Delivery Charges

• FREE delivery for orders over €150 within Ireland.

• Orders under €150: €8.99 delivery fee.

• International delivery: Charges based on weight—contact us for a quote.

When Will I Receive My Order?

• Most orders ship on a 24-hour courier service (2 working days).

• Larger orders may take 4-5 days, and pallet deliveries require scheduling.

• Orders placed before 2 PM usually ship within 24 hours.

• Orders after 1:30 PM Friday or on weekends ship the following week.

• Busy holiday periods may cause slight delays beyond our control.

Do I Need to Be Home for Delivery?

Yes, someone must sign for deliveries due to item value. If you're not home, DPD will leave a card with re-delivery or collection instructions. After two failed attempts, your order may be returned to us, and a re-delivery fee may apply.

Damaged or Incomplete Orders

We carefully pack all orders, but if something arrives damaged or incomplete, contact us within 24 hours. Report shortages within 3 days of delivery.

International Shipping

We ship to Europe and worldwide, with charges based on weight. Liquid products cannot be shipped internationally due to regulations. Contact us for a quote—we're happy to help!

Customer Service & Returns