KA Building Products have been manufacturing this product in Cornwall for many years now and have sold over 5 million kilos of this product alone so far, it is fully certificated and backed with WRAS and LABC accreditation amongst many others. KA tanking slurry can be applied to both new and old surfaces with ease alike, either brush or trowel applied to either a negative or positive side it will eradicate dampness and water penetration even under hydrostatic pressure. It can be used in many areas including:

Retaining walls, swimming pools, fish ponds, sewage plants, basements, cellars, car parks, garages, bathrooms and kitchens amongst many other areas.

Simply mix the powder to the water in a fresh bucket or container and stir until a 'custard' like texture is achieved and apply, try to only mix the amount you require as once each mix starts to cure any remaining mixture with be unusable.

Supplied in rigid solid 25kg buckets, each one bucket will cover upto 8 square metres of 2 coats or one single coat of 16 square metres, although a 2 coat application is advised.

• Retaining Walls and columns in reservoirs

• Swimming Pools prior to tiling or painting

• Concrete drinking water tanks

• Water Treatment and sewerage plants

• Foundation Slabs

• Underground Cellars, basement car parks, garages, etc.

• Pre-stressed and pre-cast concrete units

• Tunnels, silos, irrigation channels

• Bathrooms, kitchens, etc

• Lift Shafts

• Vehicle maintenance pits

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

Showing 3 of our total 131 reviews, with an average rating of 5 stars. Read all 131 reviews for 25KG Grey / White Tanking Slurry Waterproofing & Damp Proofing.
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Review Summary - 5 out of 5 based on 131 ratings.
September 5, 2025 | Steve Nelson
25KG Grey / White Tanking Slurry Waterproofing & Damp Proofing

Used in cellar on the walls and brightened it up and hopefully sealed at the same time

April 20, 2025 | RAY HEWITT
25KG Grey / White Tanking Slurry Waterproofing & Damp Proofing

Excellent product and service

April 18, 2025 | Saps
25KG Grey / White Tanking Slurry Waterproofing & Damp Proofing

Exactly as it says, great product

KA 25KG Grey / White Tanking Slurry Waterproofing & Damp Proofing

  • From £24.95
  • (Delivery from £4.99 )
1+ 12+
£28.95 £24.95
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Monday 12th October? Order within 3 hours, 21 minutes