Sticky Shed Syndrome: what it is and how we treat it.
If an old tape squeals, jams, or feels tacky when you handle it, it may have sticky shed syndrome — a common form of tape decay that gets worse every time it's played. Here's what it is, which tapes are at risk, and why it's worth stopping and getting expert help before you lose the recording for good.
A slow chemical breakdown, decades in the making.
Every magnetic tape is built from a few thin layers: a plastic base film, a magnetic coating that holds the recording, and a binder — essentially a glue — that holds that coating onto the base. Sticky shed syndrome happens when that binder breaks down.
Over years or decades in storage, the binder can slowly absorb moisture from the air. This weakens it chemically, and the tape's magnetic coating starts to lose its grip on the base film. The result is a tape that feels tacky or sticky to the touch, squeals or screeches during playback, and sheds a gummy residue onto guides and playback heads as it runs.
It's a well-documented issue in the archival and broadcast world, and it isn't a fault of how a tape was stored day-to-day — it's a chemical process built into certain tape formulations from the moment they were manufactured, and it only gets worse with time.
Signs to look out for
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A squealing or screeching soundHeard during playback, often getting worse as the tape runs.
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A tacky or resistant feelIf you gently turn the reels or spool by hand, the tape may feel sticky or drag rather than move freely.
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A musty or unusual smellSometimes described as similar to vinegar, this can indicate binder breakdown.
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Residue after a previous playbackA gummy or powdery deposit on a VCR or deck after a tape has been played is a strong warning sign.
Mostly older analogue tape, but any format can be affected.
Sticky shed syndrome is most strongly associated with analogue audio and video tape manufactured from the 1970s through to the 1990s, though not every tape from that era is affected — it depends on the specific tape stock and manufacturer used at the time.
Tapes made by certain manufacturers in this period are more commonly affected than others, but the only reliable way to know if a specific tape is at risk is to have it inspected by someone experienced in recognising the signs.
A careful, controlled process — not a quick fix.
Where a tape shows signs of sticky shed syndrome, we don't simply attempt to play it. A damaged tape only gets one good chance at a clean transfer, so treatment is approached carefully before any capture is attempted.
- 01Inspection & diagnosisThe tape is examined by hand to confirm sticky shed syndrome rather than a different issue, since the correct treatment depends on an accurate diagnosis.
- 02Controlled specialist treatmentAffected tapes undergo a controlled treatment process using specialist equipment, which can temporarily restore a tape to a playable condition for long enough to capture the recording.
- 03One careful, high-quality transferOnce treated, the tape is played back once on professional equipment and captured at the best quality achievable, since the treatment's effect doesn't last indefinitely.