$20 Bill Possible Ink Error? Never Seen One With Wet Looking Ink?

I've seen this before. A friend had a note with a similar look and I asked him about it. He told me that he sometimes irons his notes and the example with the shiny coating was one that was giving him problems, so he sprayed with Faultless, which is a brand of spray starch. I'm not saying that the OP's note is spray starched and ironed, but I am confident that something happened to this note AFTER it left the Bureau of Engraving and Printing and I wouldn't consider it an error note.

Edited to add, Welcome to CCF Lilbo52

to the Community!