I suggest you try to send them again what happened to you in the contact section. Yesterday I asked them why they use materials made of PVC to store paper money. And the next day they answered me, they told me: "The rigid PVC used does not contain no plasticizers or stearates. Our high quality PVC does not migrate" https://www.bcwsupplies.com/contact And thank you very much for sharing your experience with us. They definitely need to make better products, many are defective, although, I have not really heard of the rumor that they do not use the materials they promise [the topic of this thread], apparently that is false. But it is true that many of their products are not made in a way that they can last even if they are new.
@Phil's Coins Phil, you're describing your experience with the BCW Peel-N-Seal 2 x 2 Mylar Flip, not the Vinyl Flips that @MX-Collector was asking about; however, I do appreciate your mentioning the failure of the adhesive to hold as that is helpful to potential buyers who might be considering them in lieu of the staple type.