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Problem Solving Forum (14)


Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?


Can an epoxy polyamide zinc phosphate primer be overcoated with a synthetic enamel alkyd-based topcoat? If no, why not?


When a specification requires Manufacturer X’s system “or equivalent,” what does "or equivalent" mean, and who decides what’s equivalent?


What is the clearest way to specify the degree of smoothness required by surface preparation on an exterior wood substrate covered with deteriorated and uneven layers of paint?


Is it sufficient to specify simply that paint should be applied "according to the manufacturer’s instructions?" If not, what kind of detail should be included?


How should a contractor respond when he/she reads a specification requirement that "the nominal dry film thickness of the coating shall be 3 mils"?


When and how should ambiguities between a coating spec, data sheets and responsibilities be clarified?


What do you do when there is conflicting information between the specification and the product data sheet?


Some specifications may have requirements that the inspector may know to be extraneous or may be more restrictive than necessary to obtain a quality coating application. What is the ethical responsibility of the inspector to reject non-conforming coatings that they know will perform as intended, particularly where attempted repairs may degrade the coating system?


How should a conflict between requirements, such as film thickness, on a product data sheet and the specification be resolved?


When a specification requires Manufacturer X’s system “or equivalent,” what does “or equivalent” mean, and who decides what’s equivalent?


What is the best way for me to assure I’m getting what I want when I specify a decorative finish such as glazing or gilding?


A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?


Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”


 
 
   

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