Walk any corroding structure and the rust maps itself: weld seams, plate edges, bolt heads, corners. Coating failures cluster on geometry, and the industry's answer is almost embarrassingly simple, a brush applied stripe coat, yet it remains the most commonly deleted line in a painting programme.
Why geometry kills film
Wet coatings pull thin over sharp features as surface tension works during cure, the same mechanism our tank lining failures article traced at welds. A system specified at 300 microns may carry half that on an edge, while the same edge concentrates mechanical damage and, on weld caps, surface roughness that peaks through thin film. Failure begins there, then undercuts outward across the sound areas.
What a stripe coat is
An extra coat of the specified primer or intermediate, applied by brush or dabbed roller to welds, edges, corners, bolts and difficult access points before each full coat. Brushing works material into weld profiles and around fasteners, restoring thickness precisely where spray cannot hold it. Standards for immersion and marine service, PSPC among them per our certification article, mandate stripes; good atmospheric specifications follow.
The discipline that makes it work
Stripe in a contrasting shade so inspection can verify coverage, sequence stripes before the following full coat within overcoat windows per our humidity guide, and resist the schedule pressure that deletes them, the hours saved are repaid within a couple of years in touch up mobilisations.
Where it matters most in the UAE
Coastal C5 structures, splash zones, tank internals and every bolted connection outdoors: geometry failure accelerates with corrosivity category, so the stripe's payback rises exactly where our ISO 12944 article put the harshest exposures.
MENA Industrial Supplies quotes systems with stripe coat quantities included, so the insurance arrives in the same delivery, same day pricing from Dubai.