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Technica9 Bsslletin No, ~8-t~ Rt <br />July 2002 <br />if in doubt as to whether or not the surface preparation methods listed above are suitable for a specific job, please <br />contact Tnemec's Technical SPI~.'SCes i'epartmsnt. <br />Forms: If the generic type of existing system is unknown and/or assistance is needed in making overcoat <br />suggestions, send a completed Dopy of attached Fo--m No. I O l X 588, Request for Overcoat Candidate Systems, to <br />Tnemec's Technical Services Department. The applicable sections of this form should be completed and filed <br />regardless of whether or not assistance is requested from Tnemec Company. r1t€ached Form No. 101 X 5$9, <br />Overcoat Test Patch Evaluation should also be completed and filed. <br />Note: Tnemec Company assumes no liability with worker safety, safety of the general <br />public, contamination of the environment, or any other liability associated with <br />removal of paint containing lead and/or other toxic substances. <br />TABLE 1 <br /> <br /> <br /> <br />Adhesion Results <br /> <br />**Delamination <br />Risk Factor Risk Factor Vb'ith <br />Freeze/Thaw Locale Risk Factor With <br />Freeze/Thaw <br />+ High DFT <br />(10 mils +) <br />0 Poor 5 High 5+ 5++ <br />I 4.5 5 5+ <br />2 4 4.5 5 <br />3 ; 3.5 4 <br />~ 2 2.5 3 <br />5 Excellent 1 Low 1.5 2 <br />* Average of adhesion tests at a minimum of 3 separate locations. (3 trials at each location in <br />accordance with ASTM D 3359 Method A.) <br />** Degree of risk associated ~~~ith the existing system delaminating between coats ar from the <br />substrate following application of an overcoat system. <br />TABLE 2 <br />Generic Type Cohesive Stress Factor <br />Elastomeric ac lic emulsions 1 Low <br />Acrylic emulsions 2 <br />Medium to Ion oil alkyds 3 <br />E ox mastics 4 <br />Conventional 2-component epoxies, <br />aliphatic urethanes and moisture <br />cured urethanes 5 High <br />Page 5 of 6 <br />