In most instances we can, we remove the damaged sections and splice the tape using proper cassette splicing films and alignment jigs. We also stock spare cassette casings for most formats. As for mouldy tapes, we can fix them too. We do not charge to fix your tapes if we are converting them (another included item). If you just want us to fix them, there is a minimum charge or $10 per tape, excluding casings and subject to inspection.