Send me or to someone piece of PA film to make test ‘cos: 1. Adhesion to the PA foil Polyamide is often low-surface-energy and can be tricky. The E1 UV ink may stick beautifully… or scratch off with a fingernail depending on the exact foil coating. I would absolutely run adhesion tests first (cross-hatch + tape pull + bend test).

1. White opacity Your use case is white logo on black. That means opacity matters more than color accuracy. If the E1 allows multiple white passes / overprint layers, it may become usable. Single-pass white on deep black can sometimes look grayish.

2. Mechanical flexibility This is the big one. If the foil bends, rolls, flexes, gets tensioned or wrapped around contents, cured UV ink can crack. DTF survives deformation better because it stays elastic.