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A tear is rarely the end of a good jacket

You are descending into Borrowdale with the wind finding every gap in your clothing, and a hawthorn has just put a two-centimetre slice in the sleeve of your shell. It happens to everyone who spends time on the fells. What matters is what you do in the next twenty minutes, because a well-executed repair will outlast the jacket and a lazy one will leave you wet from the elbow down for the rest of its life. The good news is that modern waterproof fabrics are remarkably forgiving, and with a little patience you can patch a shell without flattening the breathability or killing the water repellent finish.

Know what you are repairing

Most walking shells are either a two-layer or three-layer construction. Three-layer jackets bond a membrane between an outer face fabric and an inner scrim, and they take patches beautifully. Two-layer jackets have a exposed membrane on the inside, often protected by a mesh or taffeta lining, and these need a gentler hand because the membrane itself is delicate and easily contaminated by adhesive.

Before you touch anything, decide whether the damage is a cut in the face fabric only, or a puncture that has gone through the membrane. Hold the jacket up to a window. If light shows through the hole, the membrane is compromised and you will need to patch both the inside and the outside. If the hole is smaller than a five pence piece and purely in the face fabric, an external patch is usually enough.

Assemble a proper repair kit

Keep this together at home and carry a scaled-down version in your pack. It costs very little and saves a fortune in replacement jackets.

• Isopropyl alcohol or methylated spirits and a lint-free cloth
• Sharp scissors, ideally small curved ones
• Self-adhesive repair tape in clear and in a colour that roughly matches your shell
• A heat-activated seam sealing tape for seams and high-stress areas
• A small iron or a hairdryer, plus a square of baking parchment
• A tube of flexible silicone seam sealant for awkward corners
• A sponge, some pure soap flakes or a technical cleaner, and a spray-on water repellent treatment

Step one: clean, trim and prepare

Adhesive will not stick to a dirty, damp or frayed surface, and this is where most home repairs fail. Wash the area around the damage with a weak solution of pure soap and warm water, rinse thoroughly, and let it dry completely. Never use biological washing powder, fabric conditioner or anything with added softeners, as these leave a residue that repels glue and destroys water repellency.

Once dry, wipe the area inside and out with isopropyl alcohol on a clean cloth and let it flash off for a minute. Then trim any loose threads. If you have a straight slit, round off the ends with your scissors so it becomes a small oval rather than a tear that keeps running. Resist the urge to sew a waterproof shell: needle holes let water straight through the membrane and stitching creates a line of weakness.

Step two: apply the patch

Cut your patch so it overlaps the damage by at least one centimetre on every side, and round the corners of the patch itself. Round corners peel less. If you are patching a sleeve or a shoulder, orient the patch so its longest edge runs across the direction the fabric stretches, usually horizontally around a limb.

Peel the backing and press the patch down firmly, working from the centre outwards to push out air bubbles. Then rub it hard with your thumb or a spoon for a full minute; friction and warmth make a real difference to how well the adhesive grips. If the damage has gone through the membrane, apply an internal patch first, let it settle, then place the external one. Leave the repair for twenty-four hours before wearing the jacket in anger.

Step three: seal, tape and restore the finish

Seams and the edges of large patches are the weak points. Heat-activated seam tape is applied over the join on the inside of the garment. Set your iron to its lowest setting, no steam, place the baking parchment over the tape, and press for ten to fifteen seconds, moving steadily. Test on an inside hem first, because some lightweight face fabrics will glaze or melt if you linger.

For corners where tape will not sit flat, a thin bead of flexible silicone sealant smoothed with a wet finger works well. Leave it to cure overnight.

Finally, restore the water repellency. Wash the whole jacket with a technical cleaner, then apply a spray-on repellent while it is still damp and tumble dry on low, or iron through a cloth on a gentle setting. The heat reactivates the finish and revives the beading. You will see water stand up and run off again rather than soaking into the face fabric.

Field repairs and knowing when to stop

On the hill, a strip of clear repair tape will get you home. Keep a length wrapped around a trekking pole or a water bottle so it is always to hand. Dry the fabric as best you can with a cloth, warm the tape against your body, and press it on. As a last resort, duct tape works but leaves a sticky residue that is a nuisance to clean off later, so treat it as a genuine emergency measure only.

Do carry out the proper repair once you are home, though. A jacket that has been patched carefully, washed regularly and re-proofed once a season will keep you dry for years of Lakeland drizzle and Cairngorm sleet. Only retire a shell when the membrane has delaminated across a large area or the fabric has gone brittle, and even then, cut it up for patch material and keep a sleeve in your pack. Nothing beats a scrap of known-good fabric when the next hawthorn finds you.