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October 16 - October 22, 2016

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?

Selected Answers

From Warren Brand of Chicago Corrosion Group on October 20, 2016:
We run into this question constantly. As a vendor-neutral firm, we advise our clients to have us, or someone else, write a site-specific, asset-specific specification, every time. Rankin is exactly correct: manufacturer guidelines are based on ideal situations. It is also a guideline, not a technical specification. The more you get away from a "normal" or "typical" application scenario, the less valuable the manufacturer instructions become. Further, many product data sheets give wide ranges of allowable coating thicknesses and, in some cases, the number of coats. It's not in an owner's best interest to leave this decisions up to a contractor, who, like all firms, is incentivized by profits. If a product data sheet allows for a thicknesses of, say, between 18 and 24 mils, the contractor will likely shoot for the lower figure to save on material costs while staying within  spec.

From Rankin Jays of MAPEI Corp on October 18, 2016:
Generally, "manufacturers instructions" will be based on ideal substrate, temperature and RH conditions. They will also assume method of application and applicator are constant. Required final dry film thickness per coat is a must in a coatings spec. Regardless of anything else, the right amount of coating needs to be applied. The owner has paid for it and the warranty assumes the same.

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Tagged categories: Architects; Coating Materials; Coating selection; Good Technical Practice; Research and development; Specification; Specification writing

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