u/Psychochook

I will be getting a Longer UV Printer in a couple of months (hopefully). I make products out of recycled polyethylene & polypropylene which are notoriously difficult to get things to adhere to.

I know that there are adhesion promoters and UV inks that are more suited to use with these types of plastic. Is anyone able to point me towards any specific products that they have used on these plastics that you have found works well?