Nice lettering, not as sticky as I wish it was, wish it came with instructions for how to prep surface

I will purchase them again...I need to figure out how to prep the surface better, since they didn't stick very easily. I don't think this was really an issue with the product itself, more my prep. Installed the letters on 4 Dewalt mobile tool boxes (plastic). I cleaned them with 409 cleaner and dried them. I think I should have washed them with hot water and soap.