Nylon uniforms need ink that grips the fabric and stays flexible. 222 Series is made for untreated 100% nylon and nylon stretch blends, so most jobs do not need nylon catalyst.
Waterproof or water-resistant nylon is different. Test the fabric for a coating and add nylon catalyst to every printed color when the surface is treated. Dark poly/cotton can show dye migration, so pretest before production.
* Note: For best results, always test print and cure on the actual fabric before production.