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Waterproof Coatings

Q: Will a waterproof coating stop my damp wall?

Not on its own, and not if water is still entering. Where moisture comes from a leak, a roof, plumbing or rising damp, the source has to be found and dealt with. A coating applied over an unresolved source generally fails again, sometimes worse, because moisture becomes trapped.Where damp is visible, investigate the source first.

Surface waterproof coatings, sealants and crack treatments, with clear guidance on what a coating can and cannot address.

Answer

What this covers

Damp is not automatically a paint problem. A surface waterproof coating resists water at the surface. It does not repair a leak, a roof failure, plumbing ingress, rising damp or a structural crack — those need investigating and addressing first.

Applications

Typical uses

Exterior wall surfaces exposed to driving rain
Terrace and roof surfaces, where the product suits it
Sealing around defined problem areas after the cause is addressed
Coating over sound, dry, prepared surfaces

Choosing

What affects the choice

The surface, and what is already on it
Its condition — sound, chalking, peeling, damp
Whether this is new work or a repaint
Interior or exterior exposure
The finish you want
Whether the shade needs tinting

Which stages a job needs, and how many coats, follows the surface and the manufacturer’s system for the product chosen. Not every stage applies to every project.

Quantity

How quantity is estimated

Area ÷ coverage × coats, plus any allowance you decide to add. The estimator on the tools page does the arithmetic and shows its working.

Coverage figures come from the product, not from us. They vary by product, surface porosity, preparation and application method, and the manufacturer states them on the pack or the technical data sheet. The estimator asks you to enter the figure for the product you are using.

Open the estimator

Add it

Add to your paint list

Add this to your paint list

Category level is fine. Product, brand and pack are confirmed at quotation.

ProductRoom or areaApplicationSurfaceFinishShade name or codeTinting requiredEstimated quantityUnitCoverage usedNumber of coatsPack preferencePreferred brand

Notes

Review paint list

Product availability, shade and tinting are confirmed at enquiry or counter.

Price

What affects the price

Product type
Surface
Extent of preparation
Number of layers
Coverage
Quantity

We do not publish prices. They depend on product, brand, pack size, shade and quantity, and are confirmed at quotation or counter.

Availability

What affects availability

Product and brand
Pack size
Shade, and whether it is standard or tinted
Quantity required
Whether the item is held or ordered

Availability varies by brand, product, pack size, base, shade and specification. Current status is confirmed at enquiry or quotation. Nothing on this website states stock, price or a delivery date.

Enquiry

What to send

The room or area, and what the surface is
Its condition, and photographs if you can
Net wall or ceiling area, if you have measured it
The finish you want
Shade name or code, if decided
Whether this is new work or a repaint

Questions

Frequently asked

Will a waterproof coating stop my damp wall?

Not on its own, and not if water is still entering. Where moisture comes from a leak, a roof, plumbing or rising damp, the source has to be found and dealt with. A coating applied over an unresolved source generally fails again, sometimes worse, because moisture becomes trapped.

Where damp is visible, investigate the source first.

What is the difference between a decorative coating and a waterproof coating?

A decorative coating is chosen for appearance and normal weathering. A surface waterproof coating is formulated to resist water at the surface. A sealant closes a specific joint or gap. A crack treatment addresses a defined crack. They solve different problems and are not interchangeable.