Click to view attachmentI used this stuff. Think I got it from Ebay. Maybe not tho, 'cause I remember measuring and telling them how to cut it. I'll see if I can find it and edit this reply.
I also remember someone replying to a post about this, they suggested some type of spray on stuff. Or something like the plastic dip, but that stuff is too opaque.
Keep using google, you'll find something to try.
Good Luck