Improved internal plastic coatings can protect the significant investment in completion workstruigs from erosion/corrosion, as well as minimize completion trouble time caused by pipe debris. An internally coated Class 2 drillstring was used successfully for 2 1/2 years to frac pack 17 high-productivity Gulf of Mexico deepwater completions in the Genesis field. More than 2 million lbm of abrasive proppant was pumped without a pipe failure.