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April 15 - April 19, 2019

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 Michael Halliwell of Thurber Engineering Ltd. on April 15, 2019:
I agree with Warren on this one...keep it simple and default to the folks who should know their product best: the manufacturer. The only time where you might consider other instructions is in unusual circumstances / off-spec applications, but if you're doing that, you're going to be specifying an awful lot of items, not just how to apply the paint and you would need to know 100% what you're doing because you're assuming a far greater portion of the liability on it.

From Warren Brand of Chicago Coatings Group on April 15, 2019:
As a firm that writes specifications, among other things, for a living, I think you hit the nail on the head. It's sufficient, at least, one would hope. We only write site-specific, application-specific material and application specifications. I can tell you that we use manufacturer-provided specifications as a framework, but then taken into consideration weather, time-frame, logistics, timing and other issues too numerous to list here. And, most importantly, we modify the specifications (with the approval of the manufacturer) to make the specification best for the owner, and not the material supplier. For example, we often require a more severe blast, or deeper profile than required by the manufacturer, to provide a longer service life for the client. Or we will sometimes increase the thickness of the coating for the same reason. We often try to increase the DFT range. Just recently we were working on a failure at a local, very large facility where the topcoat was specified at a DFT of 2 to 2.5 mils. I argued that was physically impossible to achieve in the field. Had we been involve in development of the specification of materials and application protocols, we would have either specified a much wider range (say 3 to 6 mils, if the material allowed it) or used a different material. Our industry wallows in what's suitable or acceptable, when our target needs to be what's optimal. And very, very few vendors are incentivized or know how to provide optimal.

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Tagged categories: Coating Application; Paint application


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