What Is String Wax?
A wax applied to the string and cables to reduce fraying, slow moisture uptake and keep the fibres lubricated.
String Wax: definition
Also called: bowstring wax, crossbow string wax, string and cable wax, string lube
String wax is a solid or paste wax rubbed into the string and cables of a crossbow. It coats the fibres, reduces friction between strands, slows moisture uptake and helps the serving stay in place.
It is applied by hand along the length of the string, avoiding the areas your manual says to leave alone, and then worked in with a fingertip or cloth. A string that is waxed on schedule lasts longer and stays more consistent than one that is left to dry out.
String wax is not the same thing as rail lubricant. Wax belongs on the string and cables. Rail lube goes on the flight track. Mixing them up is a common maintenance mistake.
Wax or lubricant: what goes where
| Part | Product | Why |
|---|---|---|
| String fibres | String wax | Reduces fraying and moisture uptake |
| Cables | String wax | Same protection as the string |
| Serving | Light wax only | Keeps threads tidy; do not soak |
| Flight track / rail | Rail lubricant | Reduces friction under the string |
| Cam axles and moving parts | As your manual specifies | Different needs; follow the manual |
| Limbs and finish | Neither | Wipe clean; follow the manual |
Why String Wax matters
The string is among the most worn parts of a crossbow. Dry, frayed fibres weaken the string and can eventually cause failure, so regular waxing is cheap protection.
A well-maintained string behaves more consistently over time. Friction and fraying changes can show up as drifting point of impact.
Moisture and dirt get into dry fibres quickly. Wax helps repel water, which is useful in damp field conditions.
How to read it on a spec sheet
- Check what the wax is made for. Crossbow and bowstring waxes are formulated for synthetic fibres.
- Read your manual for how often to wax; the interval depends on use and conditions.
- Look for any areas the manual says not to wax, such as parts near the latch.
- Note whether the product is solid or paste, since application differs slightly.
Common mistakes
- Over-waxing until the string collects dirt and grit.
- Using rail lubricant or general oil on the string.
- Waxing without cleaning the string first, working grit into the fibres.
- Ignoring fraying and relying on wax to fix it. A frayed string needs inspection, not more wax.
- Forgetting to inspect the serving while waxing.
Waxing a string
- Make sure the crossbow is uncocked, unloaded and the safety is on. Follow your manual for string access.
- Wipe the string and cables with a clean, dry cloth to remove dirt.
- Rub a small amount of string wax along the length, avoiding any area your manual excludes.
- Work it in with your fingertips until the wax is absorbed and the surface looks even.
- Wipe off excess so nothing builds up on the string.
- Inspect for fraying, loose serving or broken strands, and contact a technician if you find any.
Frequently Asked Questions
What does string wax do?
It coats the string and cable fibres to reduce friction between strands, slow moisture uptake and help hold the serving in place. That extends string life and keeps its behaviour more consistent between outings.
How often should I wax a crossbow string?
Follow your manual, which gives an interval for use and conditions. Many owners wax on a regular schedule and after wet weather, and inspect the string at the same time.
Can I use rail lube on the string?
No. Rail lubricant is made for the flight track and can leave the string greasy or damage the fibres. Use string wax on the string and cables and rail lube only where your manual says.
How much string wax should I use?
A small amount, worked in until it is no longer visible on the surface. Too much collects dirt and grit. If wax builds up in clumps, wipe it off and apply less next time.
Should I wax the serving too?
A very light application is typical, but follow your manual. The serving protects the string at wear points, so avoid soaking it or loosening the threads while you work.
Does wax fix a frayed string?
No. Fraying means fibres are damaged. Stop using the crossbow and have the string and cables inspected or replaced by a qualified technician or the manufacturer.
Is string wax needed for all crossbows?
Most manuals call for it, but details differ by string material and model. Check yours, and read our maintenance guide for the general routine before each season.
Can I wax a cocked crossbow?
No. Work on a crossbow only when it is uncocked and unloaded with the safety on. Never reach into the flight path or near the string of a cocked crossbow.
Keep learning
Guides that use this term
- GuideHow to Maintain a CrossbowHow to maintain a crossbow: string waxing, rail and moving-part lubrication, bolt inspection, storage, and when to see a technician.Read the guide
- GuideCrossbow Safety Rules for BeginnersCrossbow safety rules for beginners: finger placement, never dry-firing, safe cocking and de-cocking, range etiquette and storage habits that prevent injury.Read the guide
- GuideHow to Cock a Crossbow: Rope vs CrankHow to cock a crossbow step by step with a rope or crank, why hand cocking rarely works, and the mistakes that cause uneven strings and injuries.Read the guide
Related terms
- String and CablesThe bowstring that drives the bolt and the cables that link the cams on a compound crossbow, wear parts that need regular inspection, waxing and timely replacement.
- ServingThread wrapped tightly around the string at high-wear points to protect the fibres from abrasion and hold the nocking area together.
- Rail LubricantA lubricant applied to the flight track so the string slides with less friction and wear, used sparingly and only where the manual says.
- CamThe shaped wheel at each limb tip of a compound crossbow that the string and cables run over, creating let-off and a smoother, more efficient release of energy.
- RailThe flight deck on top of a crossbow that guides the bolt from the string to the muzzle and often carries a scope mount for accessories.
- String LatchThe catch in the rail that holds the drawn string at full draw and releases it when the trigger is pulled, and one of the most safety-critical parts.
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Definitions are general information. Manufacturer figures vary, so follow your crossbow's manual and verify local laws with the relevant authority.