2.1 Surface preparation grades
A. Grades of a surface according to the ISO 8501-1 standard
B. Surface preparation grades after high pressure water cleaning

2.2 Types of surfaces
A. Steel surfaces
a. Bare steel structure with no previous protective coatings
b. Steel surface covered with shop primers
c. Steel surface coated with a paint system which needs to be maintained
B. Hot dipped galvanized steel, aluminum and stainless-steel surfaces
a. Hot dipped galvanized steel
b. Aluminum and stainless steel