I am using Sihl spirit film 130 (glossy 3642 130 µm) for many years now. It's excellent for negatives. Sihl also coats substrates for other brands. http://www.sihl.de/content/Products.aspx?Nid=34&Aid=101&ID=272&ArID=1&GrpID=2&CatID=7&FamID=143 Kees