On any marine structure the paint fails first in the same band: the splash zone, wetted and dried by every wave and tide cycle. Continuous oxygen, continuous salt, continuous wet dry cycling make it the most corrosive few metres on the structure, with steel loss rates several times those of fully immersed sections.
Why ordinary systems die there
Standard three coat systems that survive happily on the superstructure are simply too thin and too permeable for the splash zone. UV attacks from above, chlorides concentrate as spray evaporates, and mechanical strikes from fenders, lines and floating debris breach thin films.
The glass flake answer
Glass flake epoxy was practically invented for this service. Microscopic glass platelets in the film force water and ions through a tortuous path, multiplying barrier life, and the products build 300 to 1,000 microns per coat so full protection lands in one or two coats. Specifications for jetties, quay walls and pile bands across the Gulf lean on glass flake systems for the tidal and splash bands, corresponding to the harshest ISO 12944 categories including CX.
Repair and encasement alternatives
Where blasting in the tidal band is impossible, petrolatum tape wraps with HDPE jackets protect piles with minimal preparation, and underwater curing epoxies rebuild pitted steel below the waterline before wrapping. The engineering choice is coating where preparation is achievable, encasement where it is not.
Specify for the strike, not just the salt
Choose systems with proven impact and abrasion numbers, and detail sacrificial thickness at fender lines. The corrosion allowance is cheaper in coating than in steel.
MENA Industrial Supplies quotes glass flake systems and underwater repair compounds from Dubai stock. Structures brief on the marine page; refinery jetties on the oil and gas page.