Magnaflux Zyglo ZL-4C, Water Based Fluorescent Penetrant Magnaflux| 3839 Magnaflux Zyglo ZL-4C, Water Based Fluorescent Penetrant Print Magnaflux| 3839 Magnaflux Zyglo ZL-4C, Water Based Fluorescent Penetrant This Water based fluorescent penetrant from Magnaflux is specifically designed for the inspection of materials that can be affected by petroleum-based solvents such as plastics and ceramics. It can also be used as a leaky penetrant to detect leaks. Does not contain petrochemical solvents. MGZL4C-1: ZL-4C, 5gal (18.9L) pail. MGZL4C: ZL-4C, 55gal (208L) drum. Request for information