Every industrial coating job answers the same question: coat it in the shop, coat it in the field, or both? The right answer depends on what you are coating, where it lives, and what your schedule can absorb.
The case for shop coating
A controlled shop environment wins on quality and predictability. Temperature and humidity are held inside datasheet limits year round, blast profiles are verified before coating, and cure happens on schedule regardless of weather. For new fabrication, shop coating is almost always cheaper per square foot because access is easy, steel is at working height, and there is no mobilization.
The integrated version is stronger still. When fabrication and coating happen at the same address, steel moves from final weld inspection to blast without trucking, tarping, or a second vendor's schedule.
The case for field coating
Some work cannot come to a shop. Pipeline field joints get coated after welding, in the trench. In-service tanks, structures, and equipment need blasting and coating where they stand. Connection points, field welds, and erection damage need touch-up after steel is up.
That is mobile work, and it lives or dies on equipment and trained hands. Truck-mounted blast units bring compressed air, media recovery, and containment to the site. Applicators trained on the specified system, including manufacturer-approved systems like Denso for buried service, keep the warranty intact.
Most projects need both
The standard industrial pattern: shop-coat everything that can be shop-coated, then field-coat the joints, repairs, and tie-in points that remain. Buy both from one company and the coating system stays consistent, the QC file stays in one place, and nobody argues about whose holiday test failed.
Promart runs a 25,000 square foot SSPC QP3 certified coating facility in Sarnia plus mobile sandblasting units and field crews. Blast-only scopes are welcome.
Related: Industrial coatings capability