Spot Painting to Extend Highway Bridge Coating Life: Volume 2: Research Overview (2018) / Chapter Skim
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NCHRP Project 14-30 51 CHAPTER 4 Overview of Project Tasks/Conclusions 4.1 Laboratory Testing One primary requirement of this project was to develop a test method to qualify coatings for use in spot painting repairs over typical existing coatings on bridges. This was addressed by using specially prepared test panels that replicated typical substrates encountered in spot painting (e.g.
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NCHRP Project 14-30 52 it is possible to improve the performance of liquid-applied coatings with a minimal amount of effort and generation of wastewater. KTC researchers now wish they had that procedure on more spot coatings.
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NCHRP Project 14-30 53 There may be significant differences in coatings that can impact their performance. Coating approvals obtained under the laboratory test protocol should be for specific products, not generic classes of coatings.
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NCHRP Project 14-30 54 whole or part, as discussed above, to conduct accelerated tests to screen candidate coatings. The test protocol is fully described in Appendix B Spot painting is a valuable tool for state highway agencies to use in extending the service performance of existing bridge coatings.
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