Waterproof and Restore Your Water Tank.

Water Tank leaking, cracking or worn out?
Time to fix it ANYONE CAN DO IT.

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HOW TO WATERPROOF AND RESTORE YOUR WATER TANK

DIY Video guide to waterproof, seal, and protect your Water Tank with Liquid Rubber DIY.

WHAT AUSTRALIAN WATER TANK OWNERS SAY

Real results from DIY Water Tank waterproofing with Liquid Rubber DIY.

Klaus Mittendorff

Internal water tank sealant

Decided to order the Liquid Rubber DIY Waterproof Sealer to fix the smallish leakes I had on my 10000 gal concrete drinking water tank. I had 4 crackes visible inside that were previously sort off fixed by previous owner using some epoxy resin. I used Water Stop cement based filler some time ago and it was working sort of ok. I found some moist areas on the outside of the tank in proximity of the internal cracks. The tank was finally drained again and I applied 2 coats of Liquid Robber Sealer IAW instructions for the product. The tank is now 75% full again and I have not found any damp areas on the outside since. It looks the problem is fixed for good.

Frank Novak

Liquid rubber

Sealed the tank, easy to work with, highly recommend thanks for your help Frank N Blackwood

Matthew M.

Brilliant!!!

I had a few cracks in my water tank and it was leaking like a sieve. But this stuff sealed it up no worries.

It was real easy to apply too, just painted it on like paint. Saved me a fortune too, I didn't have to pay for the tank to be removed and a new one installed. So if you've got a leaky tank or any other waterproofing needs, give this a go.

Round Tank

Diameter (d) m

Height (h) m

Total Area:

- m²

Rectangular Tank

Length (l) m

Width (w) m

Height (h) m

Total Area:

- m²

How Big is Your Water Tank?

Enter your Water Tank Area and you're done.

Enter Area

m²

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AUD 0.00

AUD 0.00 GST included

4.9/5 from 1,200+ Aussie DIYers

FREE Shipping with Australia Post

10 year warranty

Easy returns

FREE Shipping with Australia Post

10 year warranty

Easy returns

Order by 11:30 am QLD for same business day dispatch • delivery in 2 to 8 business days

Step 1: Empty and Clean the Tank

Use a submersible pump to empty the water from the tank completely.
Wash or water-blast the entire interior surface to remove dirt, algae, old silicon/sealant and debris.
Use a wet/dry vacuum to remove any remaining water. Ensure the surface is completely dry before proceeding.

Step 2: Reinforce Vulnerable Areas

Identify cracks, holes, corners, and wall-floor joins. Pre-cut Geo-Textile to bridge these defects.
Apply a first coat of Waterproof Sealant to these areas using a brush or roller.
While the sealant is still wet, embed the Geo-Textile into the sealant, ensuring there are no air bubbles or wrinkles. Brush out any air pockets for a smooth application.

Step 3: Seal Key Areas

Apply Waterproof Sealant to pipe outlets and areas just above the maximum waterline (do not coat the roof of the tank).
Use Rapid Cure Spray to instantly set the product and accelerate the job. Ensure the Rapid Cure Spray is fully dry before proceeding to the next step.

Step 4: Apply Additional Coats

Apply a second coat of Waterproof Sealant to all reinforced areas, including cracks, joints, and corners.
If fully encapsulating the entire tank interior, apply additional coats as needed to achieve a dry-film thickness of 1.5mm - 2mm (approximately 2 litres per square meter).

Step 5: Cure Before Refilling

Allow the Waterproof Sealant to cure for a minimum of 7-10 days before refilling the tank. Longer curing times are recommended in colder weather to ensure proper bonding and durability.
Use a fan-forced ventilator to ventilate the tank and accelerate the drying process.

Fun Facts About Liquid Rubber

Liquid rubber technology has been around for over 50 years, with early liquid-applied membranes dating even back to the 1960s.
Liquid rubber can stretch up to 1800% without cracking, then shrink back to the same size and restore itself after movement.
NASA Connection – The Liquid Rubber Formulations is inspired by elastomeric coatings designed for aerospace and extreme environments.

Liquid Rubber DIY vs. Traditional Sealants

Compare Liquid Rubber DIY with conventional coatings and sealants.

Feature	Traditional Sealants	Liquid Rubber DIY Kit
Waterproofing	Prone to leak	Fully watertight.
Flexibility & Durability	Cracks or peels in heat and cold.	Remains flexible.
DIY Friendly	Often tricky to use.	Brush or roll on.
Eco & Cost Effective	Harsh chemicals	Water-based, non-toxic.
Adhesion & Maintenance	Doesn’t stick well	Sticks to any Surface.

Waterproofing

Traditional

Prone to leak

DIY Kit

Fully watertight.

Flexibility & Durability

Traditional

Cracks or peels in heat and cold.

DIY Kit

Remains flexible.

DIY Friendly

Traditional

Often tricky to use.

DIY Kit

Brush or roll on.

Eco & Cost Effective

Traditional

Harsh chemicals

DIY Kit

Water-based, non-toxic.

Adhesion & Maintenance

Traditional

Doesn’t stick well

DIY Kit

Sticks to any Surface.

Can I apply Liquid Rubber over existing coatings or sealants?

For the best waterproofing results, apply Liquid Rubber to a clean, dry surface. Remove loose or peeling coatings, silicone, rust scale, and other contaminants first. This ensures maximum adhesion and long term leak protection.

What tools and equipment do I need to waterproof my roof?

Application is simple. Use a paintbrush, roller (included in our kits), or a spray machine for larger Tanks. Basic safety gear such as gloves is recommended, and keep a suitable cleaner handy for spills and tool cleanup.

What is the best way to prepare the surface for application?

Use a power washer to clean the surface. The surface must be clean, dry, and free of debris, mold, and other contaminants.

Do I need to use the rapid cure spray?

The Rapid Cure Spray is used for the Waterproof Sealant to instantly set the product. It is fully optional but we recommend using it for best results.

What colour is the Waterproof Sealant?

The Waterproof Sealant appears brown when wet but turns black when fully cured.

What are the drying and curing times?

Allow each coat of Liquid Rubber waterproof sealant to cure for 12 to 24 hours before re-coating.
Before refilling the tank let the sealant cure for at least 7 Days.

How long does shipping take in Australia?

We ship Australia wide. Orders typically arrive within 3 to 8 business days. Local pickup is also available at 1 Conway Court, Nerang, Gold Coast, QLD 4211.

Is it safe for drinking water?

Yes, it is safe. The Liquid Rubber Waterproof Sealant is potable water certified.

What spray machines are you using?

We spray Liquid Rubber DIY waterproof sealant with a Graco Mark V airless spray machine.

DOCUMENTATION & MAINTENANCE

Water Tank Maintenance Tips

Ventilation is Key: Always ensure proper ventilation during application and curing, especially when working inside a tank.

Inspect your Water Tank regularly:
Check your Water Tank every year for any signs of damage, wear. Early detection helps prevent leaks and prolongs waterproofing.

Reapply Liquid Rubber when needed:
For the best long-term performance, add a fresh layer of Waterproof Sealant every few years. This keeps your Water Tank fully protected.

Drinking Water Safety:
Liquid Rubber products are safe for potable water once cured. After the curing process, rinse the tank thoroughly before refilling to ensure no residual debris remains.