The results of the numerous slip tests performed on coated surfaces indicate many variables influence the performance of a coating. A slip coefficient, and consequently a design allowable stress for a coating, cannot be established reliably unless tests are performed on the particular coating. A test procedure for determining the slip coefficient is presented elsewhere. Classification of surfaces into narrow slip range categories based on generic paint type as currently used in the 1978 RCSC Specification was shown to be unreliable. Different paint products within the same generic category gave a wide range of average slip coefficients. It is recommended that fewer surface categories be used, and based on slip coefficients rather than paint type. The slip resistance should only be considered for slip-critical design situations.