UV Print on PP material

Hi guys, can I know all UV ink print on PP material, the PP material must need to apply corona treatment before printing?

 

Yes of corse , UV ink printing on (polypropylene) material, it's typically necessary to apply corona treatment to the PP surface before printing. This treatment enhances the surface energy of the PP, allowing the ink to adhere properly and achieve better print quality.

 

Most of them are

 

So, after printing still need to apply primer?