Mechanical damage of downhole tubing coatings through the impact of wireline tools is commonplace. This paper reports the results of laboratory "drop tube" impact tests on a range of commercially available coatings, the study being aimed at defining current coating limitations and directing future coating development work. In summarizing, work carried out thus far, the paper also defines a screening test protocol for intemal tubing coatings, and defines current operational limits for such products. Keywords: Downhole tubing; Internal coating; Impact; Coating selection.