If done correctly a ~35 year old Laserdisc's glue layers are still fine. This depends on the plant and when the disk was produced, but Pioneers plants were qui

If done correctly a ~35 year old Laserdisc's glue layers are still fine. This depends on the plant and when the disk was produced, but Pioneers plants were quite good by the late 80's. Most 1980's CD's are still fine, except for ones made by PDO UK. I'm not sure if the glue layers in DVD are organic or not, but I think the rainbow part itself is aluminum.