Specifies a test method for assessing the resistance of paint coatings to separation from substrates when a right angle lattice pattern is cut into the coating, penetrating through to the substrate. The method is applicable either as a pass/fail test or as a six step classification test (where circumstances are appropriate). The test may be carried out on finished objects and/or on specially prepared test specimens. Coverage includes: apparatus, sampling, test panels and procedure. Also includes diagrams. ALSO NUMBERED AS BS EN ISO 2409