With ZL-37 Aerosol, users can inspect high-stress critical components to detect fine, tight, and open discontinuities. Type 1, postemulsifiable, Level 4 penetrant is impervious to water to protect it from over washing and permit penetrant to remain in discontinuities for optimized detection of small defects. Product is suited for local penetrant inspections, field testing, spot inspections, and places where bulk processing is impractical.