Coating of Sand Stone for the prevention of algae growth - Evalution of Project after 3 years 5 months

Photo 1 (14.08.2019): The aim of the project is to evaluate the performance of the our 7620 Sand Stone Coating on a monument. The monument has to be cleaned every few months in order to remove algae and general contamination. The aim of the application being to prevent the formation of algae and to reduce the need for frequent cleaning. The monument was completely cleaned and three stones were coated by us.

Photo 2 (22.10.2019): The cleaning was conducted by the local council. The lower area of stone was not cleaned thoroughly. Please note the light green tone which indicates that the algae was not completely removed. The three sealed stones are now already clearly visible.

Photo 3 (20.01.2020): After several months it is apparent that there is zero algae growth on the correctly cleaned surface. The stone will retain environmental *contaminants on the surface (mostly from vehicles) as the surface texture is not altered by the application of 7620. The surface is easily cleaned with light pressure washing or with water and light brushing.

Photo 4 (19.03.2022): After 3 years and 5 months the coated areas are free of algae. Even the lower corner, which was not cleaned to the correct standard, is free of any significant algae growth. The 7620 would also reject staining from food stuffs and drinks; however this was not the main target for this trial. Suffice to say, the local council are satisfied that the 7620 is an outstanding technology.

Do you also have problems with algae growth on sandstones or other stones? We have a variety of solutions, I will be happy if you contact me.

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