Web Catalogue update October 2019

GRAFFITI REMOVAL INFORMATION 04 4151 General: The removal of graffiti is extremely demanding for any cleaning agent. Many factors play a role in cleaning because no two single applications are identical. For that reason, it is not possible to make a generally valid statement with the regard to the cleaning result. However, this does not reflect on the quality of the Wurth product, but removal is subject to the nature of the “graffiti”. In the end, the customer’s situation is sure to improve when using this product. Successful removing of graffiti depends on various influencing factors: Surface: If the structure of the surface is very coarse and porous, the colour pigments are able to penetrate deeply into the material and are very difficult to remove. Types of graffiti: Paint sprays, colour and felt pens are used in graffiti. Since the graffiti consists of various, widely differing paints and solvents, it is not possible to clean away all contaminations with one all-round cleaning agent without harming the surface. Solvents: Many graffiti cases (e.g. non water-soluble felt pens) contain solvents. Owing to this, sensitive surfaces are partly etched and damaged.” Consequently, “shadows” remain after the removal of the colour pigments of the graffiti. Under certain conditions, it is also possible that the solvent forms a chemical bond with the surface material, which cannot be removed afterwards at all. Temperature: Graffiti which has been exposed to direct sunlight for some time is even harder to remove. Freezing temperatures may delay the reacting time of the cleaning agent used for the removal of graffiti. Age: The following principal rule applies: the fresher the graffiti, the easier it can be removed. Paint layers: Graffiti consisting of several built-up layers of paint requires a longer reacting time of the cleaning agent and, in most cases, several applications. Application: The following rule applies: Always carry out a cleaning test in an inconspicuous place to test material compatibility and colour fastness. Reacting times can vary widely. This depends on the surface, type, age, etc. of the graffiti to be removed. Therefore, depending on the case, they must be individually adjusted and, if required, extended. Several applications may be required in case of very stubborn graffiti. Hard insect removal sponges and brushes are suitable for use as mechanical aids in graffiti removal. Afterwards, the surface must be thoroughly rinsed with water. Wipe off the dissolved paint with cloths. These must afterwards be disposed of as hazardous waste. After the removal of the graffiti, the cleaned area will probably stand out from the rest. This is because dirt particles are dissolved together with the graffiti. Application Examples: NZ. pub. 10/14 ©