Protection usually takes the form of a surface coating applied in a similar way to paint. The porosity of a surface is reduced and graffiti is removed from the protective surface rather than the surface material itself. There are many elements which can determine how effective the removal of graffiti is, how well surfaces can be protected and how safely these can be done. If you are uncertain you are advised to seek assistance. This may be available from your local Council, paint or hardware retailer or from a professional graffiti removal and protection service .
Many companies provide products and services specifically related to graffiti abatement.