Salt air doesn’t care whether you’re driving or parked—stray-current and salt spray will find metal and go to work. We recently treated a coastal fifth-wheel for a client who keeps their coach plugged in near a marina, just 200 yards off the water. In just one month, they saw accelerated pitting on the frame rails, tank hangers, and hardware. Grounding straps showed early bloom, and fasteners were seizing despite regular rinsing. Classic cocktail: conductive salt film, DC leakage, and dissimilar metals.
Our solution: Duratain’s VC-4 Dry-Shield Undercoating. We prepped the chassis, cleaned and neutralized contaminants, then applied Duratain’s VC-4, a dielectric, dry-cured barrier that seals seams, welds, and fastener interfaces. The result is a non-conductive shield that blocks electrolyte penetration and breaks the pathway stray current needs to attack the metal.
Follow-up at 3 and 6 months: no new pitting, rust creep halted at the edges of previous damage, holding tank hangers secure and safe, and ground strap hardware remains clean. Moisture readings normalized after storms, and continuity checks across problem joints showed the barrier doing its job. Beyond aesthetics, the owner preserved structural integrity and resale value—at a fraction of the cost of later repairs.
Quick coastal protection checklist:
• Rinse after salt exposure and let the chassis fully dry before storage.
• Inspect welds, seams, and fasteners quarterly for early bloom or blistering.
• Test campsite power for leakage; address any DC anomalies before long stays.
If your rig lives by the water—or you camp in the snow —this is RV-grade protection that pays for itself.

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