Tape Coating and Testing Results

April 5, 2009

Main Library

A Primary Mission of the Council is to promote effective means of surface preparation in the maintenance industry using water and water/abrasive blasting techniques.

The tape coating was tested in a series of accelerated and outdoor exposure tests in comparison to a moisture cured polyurethane coating system.

The testing included ASTM B117 salt fog, scratch adhesion, water vapor transmission, and outdoor weathering exposure at a marine exposure location.

Analysis of the testing included evaluating the cost of the tape coating in comparison to traditional three-coat wet-applied coating systems in conjunction with the performance data obtained from the various tests.

Key conclusions of this comparison indicate that the tape coating provides a good barrier between the substrate and the environment, but allows more scribe cutback corrosion than the moisture cured polyurethane coating system.

These samples represent the “best-case” surface preparation for testing of coating materials and allow for accurate comparison between various coating systems.

The additional cost of the primer and topcoat must be considered for the complete tape coating system.

These costs may make use of the tape coating system prohibitive on a full use scale but possibly within reason for targeted applications.

All numbers are ranges (in accordance with the test method) and were obtained after surface preparation of the samples (just prior to coating application).

After one year of exposure, there was some visible rusting on all beam sections with the MCU control system (SP-2 and SP-6 preparations).

This plot shows better resistance to scribe cutback for the abrasive blasted surface preparations compared to the hand-tool cleaning and the mill scale preparations.

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