... Aging proof 4.Improve light fastness 1-1.5 level ZWK-2 Nano silver ultraviolet-proof finishing agent: Efficient ultraviolet- ... enhance UV absorption feature of sportswear, beachwear, swimwear, casual wear (T-shirt, shirt, hat, etc.), business wear, tent, parasol, curtain ... clean,have brilliant color.[Usage]Nano ultraviolet-proof finishing agent ZWK-2,can use padding, dipping, spraying to process the ...