Wetsuit Glue and Adhesives Explained

A wetsuit is held together by glue. Every panel-to-panel seam starts with cement, every patch repair needs adhesive, and the repair you do today either lasts the suit’s remaining life or fails within a month. Wetsuit glue and adhesives include several distinct chemical types with different applications, and using the wrong one for the wrong repair is the most common DIY mistake we see in shop reports. This guide covers what each adhesive is, when to use which, and how to apply them so the repair lasts.

For the repair-kit shopping side, our wetsuit repair kits buying guide covers Aquaseal NEO, Black Witch, and complete kits side-by-side.

The chemistry, briefly

Wetsuit adhesives fall into three categories based on chemistry and behavior:

1. Flexible polyurethane adhesives. Aquaseal NEO, Stormsure Black Witch, McNett Aqua Sure, Selleys Knead-It Aqua. These cure to a flexible rubbery state that stretches with the neoprene. They’re the standard for repair work.

2. Contact cements. Neoprene cement (Barge), 3M 1357, factory-grade chloroprene cements. These bond two cement-coated surfaces when pressed together. Used during construction and in some seam-rebuild repairs. Cure to a less-flexible state than polyurethane adhesives.

3. Two-part epoxies. Selleys Knead-It Aqua, JB Weld, marine epoxies. These cure to a rigid state regardless of substrate. Used for non-flex emergency repairs (rigid gear like dive masks, weight belts, kayak hulls) but rarely the right choice for wetsuit panel repairs.

For most wetsuit repairs, you want a flexible polyurethane adhesive. The other two categories have specific use cases but are not first-choice for surface tears, seam splits, or worn-knee fills.

Aquaseal NEO

Aquaseal NEO is the dominant US-market wetsuit repair adhesive, manufactured by Gear Aid (formerly McNett). The formula is a single-component polyurethane that cures by absorbing atmospheric moisture, bonding to neoprene, rubber, fabric, and most plastics.

Specifications:

• Cure time: 8 to 12 hours at 70°F room temperature; longer in cold or humid conditions
• Color: dries clear with a slight yellow tint, then darkens to near-black on neoprene contact
• Flexibility: cured material stretches similarly to the surrounding neoprene
• Price: $12 to $18 for a 0.75-ounce tube
• Shelf life: ~18 months unopened; 4 to 6 weeks once opened

What Aquaseal does well:

• Surface tear repairs (1-inch to 4-inch tears)
• Seam-split repairs along glued and blind-stitched seams
• Pinhole and puncture fills
• Bonding fabric tape over a tear
• General-purpose neoprene-to-neoprene repair

What Aquaseal doesn’t do well:

• Vertical applications (it runs before curing, leaving a thin spot at the top of the bead)
• Filling thick worn areas (the bead is too thin to fill 2-3mm of worn rubber)
• Underwater repairs (it cures by air-moisture absorption, not water immersion)

For most US-based wetsuit owners, a single tube of Aquaseal NEO covers 5 to 10 typical repairs and is the right starting point. Available at REI, surf shops, dive shops, and via the wetsuit repair kits guide.

Stormsure Black Witch

Stormsure Black Witch is the UK-and-Europe standard for wetsuit repair. The formula is also a single-component polyurethane, but with a thicker consistency than Aquaseal and a slightly slower cure.

Specifications:

• Cure time: 12 to 24 hours at 70°F; up to 36 hours in cold or humid conditions
• Color: dries black throughout; matches black neoprene perfectly
• Flexibility: comparable to Aquaseal once cured
• Price: $14 to $20 for a 5-gram tube
• Shelf life: ~12-18 months unopened

What Black Witch does well:

• Filling worn-through knee patches (the thicker consistency holds shape on vertical applications)
• Heavy-fill repairs where Aquaseal would be too thin
• Filling deep abrasion damage

What Black Witch doesn’t do well:

• Fine surface tears (the thick bead is overkill)
• Fast repairs (long cure time means downtime)

Black Witch and Aquaseal are complementary tools rather than substitutes. Many serious wetsuit owners keep both, using Aquaseal for routine surface repairs and Black Witch for the bigger fill jobs.

For UK and EU users, Black Witch is more widely available at outdoor and dive shops. For US users, both are available through Amazon and specialty retailers.

Neoprene cement (Barge and others)

Neoprene cement is a contact adhesive used during wetsuit construction. The chemistry is chloroprene rubber dissolved in a solvent, which evaporates after application and leaves a tacky surface that bonds when pressed against another cement-coated surface.

The factory process:

1. Cement is brushed onto both panel edges
2. Solvent evaporates for 5 to 10 minutes (the surfaces become tacky but not wet)
3. Edges are pressed together under pressure
4. Bond cures fully within 30 minutes

For DIY use: Neoprene cement works for full seam reconstruction (cutting away a failed glued seam and re-gluing it from scratch), but it’s harder to use than Aquaseal because of:

• Required application to both surfaces simultaneously
• Solvent evaporation timing (too early = weak bond, too late = no bond)
• Less flexibility once cured (the bond is somewhat brittle compared to polyurethane)

For most repair use cases, Aquaseal NEO produces a better repair with less effort.

Neoprene cement is available from factory-supply retailers, sometimes from specialty surf-repair shops, and rarely from general retailers. Brands include Barge All-Purpose Cement, 3M 1357, and various factory-grade options.

When to use which

A decision matrix for common repair scenarios:

Damage	Best adhesive	Cure time	Notes
Surface tear under 4 inches	Aquaseal NEO	8-12 hrs	Run thin bead inside the tear, align edges, weight flat
Seam split along GBS line	Aquaseal NEO	8-12 hrs	Apply both inside and outside the seam
Worn-through knee patch	Black Witch (or patch)	12-24 hrs	Black Witch fills better than Aquaseal
Pinhole or small puncture	Aquaseal NEO	8-12 hrs	Single drop, push into hole, smooth
Multi-panel separation	Neoprene cement (factory-style)	30 min	Or shop repair; technical
Failed liquid-tape seam	Aquaseal NEO over GBS	8-12 hrs	Strip old tape if peeling, re-apply Aquaseal
Emergency field repair underwater	Selleys Knead-It Aqua	Cures wet	Stopgap only; redo properly later

For specific repair walkthroughs covering each scenario, our repair kits guide covers complete repair workflow.

Application technique

Three details that separate a successful repair from a failed one:

1. Surface preparation. Wash the suit with wetsuit shampoo and rinse thoroughly. Dry the area completely before applying adhesive. Salt residue and bacterial film prevent the adhesive from bonding properly. Wipe with isopropyl alcohol on a clean cloth for an extra-clean surface.

2. Apply less than you think. A common DIY mistake is applying too much adhesive. The bead should be thin enough to spread but not pool. Excess squeezes out under pressure and wastes glue. For a 2-inch tear, you need maybe 1 cm of glue from the tube.

3. Cure flat with weight. Lay the suit flat with the repair facing up. Place a small weight (a book wrapped in plastic, or a piece of clean wax paper with a weight on top) over the repair to maintain alignment during cure. Disturbing the repair during the first 4 hours of cure can prevent proper bonding.

4. Cure indoors, out of cold. Aquaseal and Black Witch both cure faster in warm dry conditions. A 70°F indoor cure is significantly faster than a 50°F garage cure. For garage-stored suits, bring the repair indoors for the cure window, then return to the garage.

5. Test gently before next use. After cure, test the bond by gently flexing the repair. Watch for adhesive cracking, lifting, or any visible separation. If the repair holds under flex, it should hold in water.

When to take it to a shop

Five repair scenarios worth a professional shop:

1. Long zipper-blowout tears (over 4 inches). The repair becomes more about re-aligning panels under tension than just filling glue.
2. Damaged or missing zippers. Replacement requires specialized equipment.
3. Multi-panel separations. The repair requires panel-by-panel cement work.
4. Seam delamination across multiple seams simultaneously. Often signals end-of-life rather than repair-worthy.
5. A repair you’ve already attempted twice without success. Something else is going on.

Shop repair pricing typically runs $30 to $80 depending on damage. Below about $40 of suit value remaining (a budget 3/2 with 1 year of life left), replacement is usually the better economics. Above that, a professional repair extends the suit by years.

For broader gear context: wetsuit longevity study, wetsuit care and maintenance, seam types explained, wetsuit construction guide, how long does a wetsuit last.

Sources cited

• Gear Aid (Aquaseal manufacturer). Aquaseal NEO product documentation. Official manufacturer specifications and application guidelines.
• Stormsure Ltd. Stormsure adhesive line. Black Witch and related Stormsure adhesive documentation.
• Surfer’s Path. Wetsuit repair archives. Practitioner-focused industry coverage of seam repair workflows.