What ink is used for manual screen printing of polyethylene?

Good evening. Modified PVC solvent-based silk-screen printing ink containing CPE or CPP as adhesion promoter is generally used on the surfaces of PE, PVC and PP. Ordinary PVC ink can also be used to print PE and PP. If conditions permit, it is also possible to spray PP water on the bottom of automotive sheet metal repair bumper in advance, and then print with other silk-screen inks after drying. Benzene-soluble CPP is much better than ester-soluble CPP in PE fastness.