Hi, I'm looking for an adhesive to bond cut 6X9 negatives (BW & Colour) on to blank 4X5 sheets. My main concerns in descending order are transparency, flatness, cost & ease of handling. I was originally thinking about using Kodak film cement, but I don't think that'll work with a lot of modern films. I've also considered using two glass plates for sandwiching, but getting those made is probably too expensive and reduces my lap options for enlarging down the line. If anyone has any ideas or experience on the matter I'd really appreciate hearing about it. Thanks.