A black tarp appears to be the preferred low-budget "repair" for this kind of slide.

2011/06/19 12:15:53

Exposure mode: Action program (based towards fast shutter speed)
Metering Mode: matrix
Exposure time: 0.0017 s (1/600)
Aperture: f/5.6
Focal length: 8.0mm (35mm equivalent: 37mm)
ISO: 200
Flash: No (auto)
File size: 2945440 bytes
Camera maker: FUJIFILM
Camera model: FinePix F10
Resolution: 2784 x 1856