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PermaSEAL Tanking Slurry Grey 25kg Bucket

98% of 100
£36.00 Ex VAT
£43.20 Inc VAT
Brush applied cement based coating for waterproofing and damp proofing masonry above and below ground.

Tanking Slurry - Grey

PermaSEAL Tanking Slurry is a single pack cement-based coating, consisting of Portland Cements, blended and formulated with quality graded aggregates and chemical modifiers. It is ideal for tanking cellars and basements, keeping them dry by effectively blocking water ingress. It is easy to use - you can apply it directly onto damp substrates with a brush. 

In addition, PermaSEAL Tanking Slurry contains an acrylic polymer that imparts improved strength, bonding and abrasion resistance. After hardening, PermaSEAL tanking becomes a vapour permeable and watertight coating capable of withstanding water pressure.

Tanking Slurry Uses

PermaSEAL Tanking Slurry can be used in the following situations:

  • Tanking of basements and cellars
  • Above ground damp proofing
  • Sealing of tanks and ducts
  • Internal and external waterproofing
  • Lining of storage tanks for potable water
  • Coating of brick and block work structures

Using Tanking Slurry

PermaSEAL cementitious tanking is mixed with water on site and applied directly to the surface by brush. It is safe to apply on damp substrates. It is specially formulated to enable excellent adhesion to construction surfaces.

Our tanking slurry is available in two colours, white and grey. As a general guide, use one colour for the first coat then the other for the second coat which makes it easier to see if you have completely covered the surface.

Plastering over tanking slurry

Once tanking is complete…

PermaSEAL Tanking should always be covered by a minimum of a 10mm coat of 4:1 sand and cement render, a 1:1:6 Lime based render or PermaSEAL Renovating Plaster. After this render coat has been applied, dot and dab plaster board, multi finish or a breathable paint can be applied.

Note: all tanking products are prone to sweating during the drying out phase and if left exposed after the product has cured. We suggest they are always covered as above and / or adequate ventilation is installed to manage the humidity.

For more information, read our guide on tanking a cellar or waterproofing a garage with tanking slurry..


  • Single component product (just add water)
  • Excellent adhesion to prepared surfaces
  • Easy to apply by brush
  • Microporous (breathable)
  • Durable and long lasting
  • Supplied in grey and white
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