Short answer: a sacrificial anti-graffiti coating is removed together with the graffiti and must be re-applied after every clean. A non-sacrificial, or permanent, coating stays on the surface: the graffiti is cleaned off and the protection remains, typically for years. For public assets that are tagged again and again, such as underpasses, bus shelters, signage, utility cabinets and boundary walls, a non-sacrificial coating usually costs less over its life. Sacrificial systems suit heritage surfaces and sites that are rarely hit.
The three types
| Type | How it works | After a clean | Best for |
|---|---|---|---|
| Sacrificial | A soft film, often wax or polysaccharide based, that graffiti sits on instead of the surface | The film comes off with the graffiti, usually by hot-water washing, and must be re-applied | Heritage or sensitive masonry; sites tagged rarely |
| Semi-sacrificial | A durable base layer with a renewable top layer | The top layer is renewed after cleaning | Sites that need some reversibility but are cleaned more often |
| Non-sacrificial (permanent) | A hard, low-energy film that paint and ink cannot key into | Graffiti is removed with a cleaner; the coating stays | Assets tagged frequently: metal, glass, painted surfaces, transport and public infrastructure |
How to choose
- How often is the surface hit? The more often it is cleaned, the stronger the case for a permanent coating, because a sacrificial one has to be re-applied every time.
- Is the surface porous or non-porous? Brick, concrete, render and stone absorb a coating and need a product made for masonry. Metal, glass, powder coat and painted surfaces need a thin film that bonds on top.
- Does the surface need to breathe? Masonry must be able to release moisture. Choose a coating that is designed for porous substrates rather than a film that would trap water.
- Is the building listed or historic? Conservation guidance often favours sacrificial or fully reversible systems.
- What do access and labour cost? On bridges, rail assets and high walls, the cost of getting a crew to the surface usually outweighs the cost of the coating, which again favours fewer applications.
Life-cycle cost, worked through
Take a wall that is tagged and cleaned six times a year. With a sacrificial coating, each of those six cleans is followed by a fresh application, so the crew, access and material are paid for six times a year. With a non-sacrificial coating, the surface is coated once and each clean is just the clean. Nanoman Anti Graffiti Non Porous covers 1,000 to 1,100 sq ft per litre, about ₹23 to ₹26 per sq ft, and lasts up to 7 years depending on exposure and cleaning.
Porous and non-porous surfaces need different products
| Anti Graffiti Non Porous | Anti Graffiti Porous | |
|---|---|---|
| Surfaces | Aluminium, stainless steel, zinc, copper, brass, powder coat, 2-pack polyurethane and epoxy paints, glass, GRP | Brick, concrete, render, block work, natural and reconstituted stone |
| Type | Non-sacrificial | Non-sacrificial |
| Application rate | 10 to 15 ml per m², one thin coat | 80 to 100 ml per m², one even coat |
| Method | Microfibre applicator or HVLP spray | Brush, roller or airless spray |
| Weather window | Water-resistant after 8 to 12 hours; fully cured in 5 to 7 days | Rain-safe after 5 hours; fully cured in 7 days |
| Supply | Ready to use; order online | Ready to use; trade quote |
Application details that decide whether it works
- Start clean and dry. Remove existing graffiti, dirt, efflorescence and release agents. Degrease metal with a solvent wipe; on aluminium and zinc use a mild, pH-neutral detergent and never sodium hydroxide, which etches these metals.
- Respect the conditions. Apply between 5 °C and 30 °C and 30% to 80% relative humidity, out of direct sun, on a surface that is completely dry. New concrete should be at least 28 days old.
- One coat only. Both products are applied as a single coat. On non-porous surfaces, fix streaks within 10 minutes, because after that the surface repels a second coat.
- No existing sealers. Silicone, wax, oil or fluoropolymer residues stop the coating from bonding and must be removed first.
Removing graffiti from a protected surface
On a non-sacrificial coating, graffiti does not bond to the surface underneath, so it is removed with a graffiti remover, a soft brush or cloth and a rinse, without abrasive blasting. That keeps the substrate and the coating intact for the next time.
Planning a programme for public assets? Tell us the surfaces and the area, or read more on our anti-graffiti coatings page.
Frequently asked questions
What is the difference between sacrificial and non-sacrificial anti-graffiti coatings?
A sacrificial coating comes off together with the graffiti and has to be re-applied after every clean. A non-sacrificial, or permanent, coating stays on the surface: the graffiti is cleaned off it and the protection remains.
How long does a non-sacrificial anti-graffiti coating last?
Nanoman Anti Graffiti Non Porous lasts up to 7 years, depending on exposure and how often it is cleaned.
Can anti-graffiti coatings be used on brick and concrete?
Yes, but porous masonry needs a coating designed for it, applied at a higher rate so it penetrates the surface. Use Anti Graffiti Porous on brick, concrete, render and stone, and Anti Graffiti Non Porous on metal, glass and painted surfaces.
How is graffiti removed from a non-sacrificial coating?
With a graffiti remover applied as directed, a soft brush or cloth and a rinse. Abrasive blasting and harsh scrubbing are not needed and should be avoided.
Which type suits heritage buildings?
Heritage surfaces are often specified with sacrificial or fully reversible systems so the original material is never permanently altered. Follow the conservation guidance that applies to the building and test any coating on a small area first.