How is vehicle weather sealing validated?

Sealing validation includes: Water spray booths replicating rain at various angles and intensities, water fording tests at specified depths and speeds, pressure testing (positive and negative pressure across seals), dust chamber exposure, car wash simulation, and long-term durability under UV and temperature cycling. Leak detection uses UV tracer dye, water-sensitive paper, or electronic detection. Tests evaluate door seals, glass seals, body openings, lamp assemblies, and underbody plugs. Targets include zero water entry into specific zones with appropriate test severity.