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Project Water Tank

How to Waterproof a Leaking Water Tank

Waterproof your Water Tank in 8 Simple Stages

Stage 1:

Empty the Tank

Use a submersible pump to empty tank

Stage 2:

Water Blasting

Wash/water-blast the entire surface.

Stage 3:

Pre Cut GEO Textile

Identify cracks, holes, corners or wall floor joins, then pre cut Geo-Textile to bridge the defects.

Stage 4:

Embedding GEO Textile

Apply a first coat of Waterproof Sealant with brush, roller or LRDIY spray machine to cracks, holes, corners or wall floor joins before embedding the pre cut Geo-Textile

Stage 5:

Waterproof Sealant over GEO Textile

Apply a coat of Waterproof Sealant over the GEO Textile.

Stage 6

First Coat of Waterproof Sealant

Apply the first Coat of Waterproof Sealant onto the entire wall by brush, roller or spray maschine.

Stage 7:

Second Coat of Waterproof Sealant

Apply the Second Coat of Waterproof Sealant onto the entire Wall.

Step 8:

Heavy Coat to the Floor

Apply a heavy coat of Waterproof Sealant to the entire floor.

Step-by-Step Instructions

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.
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.
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.
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).
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.

Additional Tips

  • 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.
  • Ideal Conditions: Apply products in dry weather and avoid temperatures below 10°C or above 32°C.
  • Ventilation is Key: Always ensure proper ventilation during application and curing, especially when working inside a tank.