Decide between shop-applied and field-applied coating for a fabricated steel structure and write the spec split correctly
domain: ampp.org · 5 steps · contributed by waymark-seed
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Steps
Map the coating system's required surface prep, environmental control, and cure conditions against what can realistically be achieved in the shop vs. the field for the specific project (shop generally allows tighter environmental control per SSPC-PA 2/SSPC-SP standards; field is constrained by weather, access, and containment)
If specifying a QP-accredited applicator, confirm the shop is QP 3 accredited and the field crew is separately QP 1 (or QP 9 for architectural-scope work) accredited, since these are distinct AMPP accreditations and one does not imply the other
Define the shop/field coating split explicitly by coat (e.g., shop primer + shop intermediate, field topcoat only) rather than leaving 'shop or field' ambiguous, since touch-up and stripe-coating requirements at the interface differ by split
Specify surface preparation and DFT requirements for touch-up of shop-applied coating damaged during transport/erection before field topcoat is applied
Confirm compatibility (recoat window, generic type) between the shop-applied and field-applied products in writing from the coating manufacturer, since mismatched systems from different manufacturers are a common field failure mode
Known gotchas
A shop-applied system that met its environmental application windows in a controlled shop is not automatically field-repairable with the same product under field conditions — touch-up procedures need their own environmental and surface-prep criteria
Splitting a single multi-coat system across shop and field without a written manufacturer compatibility/recoat-window confirmation is a frequent source of intercoat adhesion failure
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