Collection: Tank seal

Premium Water Tank Repair Solutions and Sealants in Australia |RTT Sealant

Discover top-quality water tank repair and water tank sealant products to effectively fix leaks and ensure lasting waterproofing. Explore RTT Sealant's range for reliable solutions in Australia. A water tank leak costs money and is worthless. A renovated water tank with RTT Sealant will increase the value of your property by tens of thousands of dollars. 

Save thousands of dollars on the removal of the old Tank and installation of a new Tank. Seal it with RTT - Sealant Waterproofing solution!

Find all products needed to waterproof your Water Tank repair solution below ↓

RTT Water Tank Products

For all your water tank needs buy RTT Waterproofing Sealant products.

  • Step 1:

    Make sure the tank surface is clean and dry. Use a pressure washer/water blaster to clean the surface.

    Allow the surface to dry before proceeding to the next step.

  • Step 2:

    Once dry, apply the RTT - Waterproof Sealant by brush, roller or spray machine to cracks, holes, corners, wall floor joints, pipe inlet/overflow, or over the top of applied RTT - Seam Tape.
    Apply RTT - GEO Textile at the same time onto the wet product over the holes, cracks, floor wall joints etc. and ensure you brush the air from underneath the applied GEO Textiile and make sure there are no crinkles.
    Apply RTT - Quick Dry onto the wet RTT - Waterproof Sealant layer for a faster cure.

    Allow to cure for 24h.

  • Step 3:

    Apply 2 - 3 coats of the RTT-Waterproof Sealant to the walls and any columns, so that the walls and columns are finished.
    Allow 4 - 6 hours to cure between each coat.

  • Step 4:

    Apply a thick coating to the floor and work your way toward the ladder. overlapping the floor wall joints.

  • Step 5:

    Climb out of the tank and use an extension on your roller to cover the area where the ladder was, making a total seamless membrane in your tank.
    The floor should be approximately 2mm thick with wet RTT Sealant.

  • Step 6:

    Allow 10 Days for the product to cure with the the fan continuously going (24/7) to dry out all the moisture. 
    It is very important that the waterproof membrane is fully cured before filling the tank.


    For safety reasons, ensure to use a Ventilator / Fan to blow air into the Tank for air circulation. The fan needs to be over the manhole to blow the warm environmental air into the tank.  It also dries and cures the membrane quicker.

  • Ensure Water Tank Integrity with RTT Sealant: A Comprehensive Guide to Repair, Seal, and Prevent Leaks

    Water tanks are vital components of any property, providing essential access to fresh water for drinking, cooking, and hygiene. However, over time, these tanks can develop leaks or cracks, compromising their functionality and potentially leading to costly repairs. Fortunately, with the right tools and techniques, you can effectively repair and seal water tank leaks, ensuring the integrity of your water system. Enter RTT Sealant – your go-to solution for water tank repair and sealing needs.

    At RTT Sealant, we understand the importance of a reliable water supply for your property. That's why we offer a range of specialised products designed specifically for water tank repair and sealing. Our collection of tank sealants is formulated to withstand the rigors of travel and outdoor use, providing durable and long-lasting solutions to keep your water tanks leak-free and secure.

  • Identifying Water Tank Issues:

    Before embarking on any repair or sealing project, it's essential to identify the source of the problem. Common signs of water tank issues include visible leaks, dampness or pooling water around the tank area, and a decrease in water pressure or supply. Once you've pinpointed the problem areas, you can take the necessary steps to address them effectively.

  • Repairing Water Tank Leaks:

    For minor leaks or cracks in your water tank, RTT Sealant offers a range of repair solutions that provide quick and reliable fixes. Our sealant products are specially designed to bond to a variety of surfaces, including plastic, fiberglass, and metal, ensuring a watertight seal that withstands the test of time. To repair a water tank leak using RTT Sealant, follow these simple steps:

    1. Preparation: Clean the surface around the leak thoroughly to remove any dirt, debris, or residue.
    2. Application: Apply RTT Sealant directly to the leak or crack, ensuring complete coverage and a tight seal.
    3. Drying Time: Allow the sealant to dry completely according to the manufacturer's instructions.
    4. Testing: Once dry, test the repaired area by filling the water tank and checking for any signs of leakage.

  • Sealing Water Tanks Preventatively:

    In addition to repairing existing leaks, it's essential to take proactive measures to prevent future water tank issues. RTT Sealant offers a range of preventative sealants that create a protective barrier against leaks, cracks, and corrosion, ensuring the long-term integrity of your water tanks. By applying RTT Sealant proactively, you can enjoy peace of mind knowing that your water supply is secure. potable, eco friendly and reliable, even in the most challenging conditions.

  • Why Choose RTT Sealant for your Water Tank Leak?

    When it comes to water tank repair and sealing, RTT Sealant stands out for several reasons:

    - Specialised Products: Our sealants are specifically formulated for water tank applications, providing superior adhesion and durability.
    - Easy Application: With RTT Sealant, repairing and sealing water tanks is quick and straightforward, requiring minimal time and effort.
    - Long-lasting Results: Our sealants are designed to withstand the harshest environments and conditions, ensuring reliable performance year after year.
    - Expert Support: The team at RTT Sealant is committed to providing expert guidance and assistance every step of the way, ensuring that you achieve optimal results with our products.

  • Finally call for a water tank leak quote

    Water tank issues can quickly escalate into major problems if left untreated. With RTT Sealant, you can address leaks, repair cracks, and seal your water tanks effectively, ensuring a reliable and secure water supply for your property. Explore our collection of tank sealants today and experience the difference that RTT Sealant can make for your outdoor adventures.


How much Product do I need?

A minimum of 2L/m2 of RTT - Waterproof Sealant for concrete surfaces.

A minumum of 1.5L/m2 RTT - Waterproof Sealant for metal surfaces.

How long does it last?

We've been testing and improving our products for water tank repairs since 2008. When properly applied the Waterproof Membrane will extend the life of your Water tank by 10+ year.

Why do i need the GEO Textile?

The GEO Textile is sandwiched with the Waterproof Sealant over cracks, holes, seams, vents etc. It is used for reinforcement and stabilisation purposes.

What is the Seam Tape for?

The Seam Tape is used to cover bigger holes and cracks as it is firmer than the GEO Textile. Like the GEO Textile, it is used for reinforcement and stabilisation purposes.

Why do I need the Quick Dry Spray?

The Quick Dry Spray is optional. However, we recommend spraying it on top of a wet Waterproof Sealant layer for a quicker cure and to protect it from moisture for your water tank repair.

  • DIY Water tank repairs done right

    Measure twice on your water tank repair job for accurate information for buying the right amount of products. Don't waste time under stating your measurements to save a few dollars.

  • Be sure on all patch work

    Take your time when repairing a water tank. Double the amount of GEO tape across cracks, joins and holes. Be sure to let the patch cure properly before starting your first layer.

  • Water tank repairs how thick matters

    Be sure to put at least 1mm thichness on each layer and wait 24 hours in between to cure before your final coat to maximise the effectivenes of your water tank repair.

DIY is not an option for you?

We work with accredited contractors and take on large commercial projects.

Contact us on or use the Contact form and let's discuss your project!