Keim APP-S anti-graffiti paint is ideal for protecting masonry surfaces
Graffiti can be costly, time-consuming and damaging to both commercial and residential buildings. Whether it’s a listed building, school, retail premises, office block or residential development, removing graffiti without damaging the underlying surface is often the biggest challenge.
Choosing the right anti-graffiti paint or protective coating can dramatically reduce cleaning costs while preserving the appearance of the building for years to come.
One of the most effective solutions available is Keim APP-S, a semi-permanent anti-graffiti protection system specifically developed for porous mineral surfaces.
Unlike many permanent coatings that can alter the appearance or breathability of masonry, Keim APP-S provides invisible protection whilst allowing the substrate to continue performing as intended. It is a patented, reversible system based on natural polysaccharides and water that protects surfaces without permanently changing them.
What is anti-graffiti paint?
Although commonly referred to as anti-graffiti paint, many modern systems are actually clear protective coatings rather than coloured paints.
These coatings create a protective barrier that prevents spray paint, marker pens and other graffiti materials from penetrating the substrate. When vandalism occurs, the graffiti can be removed without causing permanent damage to the underlying surface.
Anti-graffiti systems generally fall into two categories:
- Permanent systems – designed to withstand repeated cleaning without needing reapplication.
- Sacrificial (semi-permanent) systems – removed during the graffiti cleaning process before being reapplied.
Keim APP-S belongs to the second category and is often the preferred solution for heritage buildings and breathable mineral surfaces.
Why choose Keim APP-S?
Many anti-graffiti coatings form an impermeable film over the surface. Whilst effective, these can sometimes trap moisture, alter the appearance of masonry or prove unsuitable for conservation projects. Keim APP-S has been specifically designed to avoid these problems.
Key benefits
- Protects against graffiti and airborne pollution
- Suitable for brick, natural stone, concrete, render and mineral paints
- Virtually invisible once dry
- Low sheen finish with minimal colour change
- Fully breathable and vapour permeable
- Bio-based formulation using natural polysaccharides
- Solvent free
- Reversible sacrificial protection
- Can be applied by brush, roller or airless spray
- Suitable for most porous vertical construction surfaces
How does Keim APP-S work?
Rather than creating a hard permanent coating, Keim APP-S forms an ultra-thin protective layer over the surface. If graffiti is applied, the coating absorbs the damage instead of allowing the paint to penetrate the substrate.
The graffiti and protective layer are then removed together using high-pressure hot water or the appropriate cleaning method, before a fresh coat of APP-S is applied. This means the original building material remains protected throughout the cleaning process.
Ideal applications
Keim APP-S is particularly suited to buildings where appearance and breathability are important. Typical applications include:
- Schools and universities
- Railway stations
- Public buildings
- Town centres
- Shopping precincts
- Listed buildings
- Churches
- Museums
- Residential developments
- Brick façades
- Stone buildings
- Concrete walls
- Rendered elevations
Because the coating remains highly vapour permeable, it is especially suitable for mineral substrates where moisture movement is essential.
Suitable surfaces
Keim APP-S can be used on most porous, wettable construction materials including:
- Brickwork
- Natural stone
- Concrete
- Mineral render
- Cement render
- Lime render
- Silicate painted surfaces
- Existing KEIM mineral paint systems
Some substrates may require a suitable primer before application depending on porosity and absorbency.
Why breathability matters
Many traditional waterproof sealers and permanent anti-graffiti coatings reduce the natural breathability of masonry. This can lead to trapped moisture, blistering, frost damage and accelerated deterioration – particularly in older buildings. Keim APP-S forms a breathable protective layer that allows water vapour to escape whilst still providing excellent resistance to graffiti. This makes it a particularly attractive specification for conservation projects and historic buildings.
Application overview
Surface preparation is critical to achieving long-lasting protection, so before application you should ensure the surface is clean, dry and structurally sound. Remove any existing graffiti, dirt or loose material and repair damaged substrates where necessary. The surface should be primed if recommended for the substrate.
Keim APP-S is then applied as a two-coat system. On larger projects, airless spray application is recommended for maximum efficiency and uniform coverage.
Is Keim APP-S better than a permanent anti-graffiti coating?
Both systems have their advantages. Permanent coatings are often preferred in areas subjected to very frequent vandalism. However, Keim APP-S offers significant benefits where maintaining the original appearance and breathability of the building is the priority. This makes the product particularly suitable for heritage buildings, conservation projects, decorative masonry, natural stone and mineral painted façades. Its reversible nature means the substrate itself is never permanently altered.
Frequently Asked Questions
Is Keim APP-S actually a paint?
No. Although many people search for anti-graffiti paint, Keim APP-S is a clear protective coating designed to preserve the original appearance of the substrate.
Can graffiti be removed easily?
Yes. Graffiti is removed along with the sacrificial protective layer, after which a fresh coat of APP-S is reapplied.
Does it change the appearance of brick or stone?
Very little. Once dry, Keim APP-S has a low sheen finish and generally remains almost invisible on suitable substrates.
Can it be used on listed buildings?
In many cases, yes. Because it is breathable and fully reversible, sacrificial systems such as Keim APP-S are often considered suitable where permanent coatings may not be appropriate. Always consult the relevant conservation authority where required.
Protect your building before graffiti happens
Removing graffiti after the event is always more expensive than preventing permanent damage in the first place.
Keim APP-S provides an environmentally responsible, breathable and virtually invisible anti-graffiti protection system that is particularly well suited to masonry and mineral surfaces. Whether you’re protecting a commercial property, public building or historic façade, investing in a quality anti-graffiti coating can significantly reduce future maintenance costs while preserving the appearance of the building.
If you’re unsure whether Keim APP-S is suitable for your project, contact the technical team at Promain for expert advice on substrate preparation, compatibility and application methods.