We use Oracal 631, being a matte finish we use the recommended HT55 transfer tape. It does the job well, very well, but we are selling items faster than I can make them daily so what I would like to do is do up a bunch ahead of time and then just do runs when I get low on stock. Which brings the question up of how long(if even applicable) is too long to leave them on the transfer tape? Keeping in mind that the people installing the vinyl are COMPLETE beginners. This may not even be an issue but I wanted to be sure before I started doing it and then having customers complain they are having issues(other than the normal novice mistakes).