Keeping a CGM sensor stuck for 10-14 days is a challenge for many users — especially those who sweat, swim, or have sensitive skin. Here are the most effective adhesive patches and overlays.
Why Sensors Lift Prematurely
CGM adhesive is designed for average skin in average conditions. Heavy sweat, frequent showering, body hair, skin conditions, and physical activity all accelerate edge lifting. A reinforcement patch addresses most of these issues.
Simpatch
The most popular adhesive overlay for Dexcom and Libre sensors. Pre-cut to fit the sensor exactly with a hole in the center for the sensor dome. Comes in multiple colors. Medical-grade adhesive that outperforms the sensor’s original adhesive for most users. A pack of 20 patches costs ~$12-15 on Amazon.
Best for: Active users, swimmers, hot climates.
Skin Tac
A liquid adhesive barrier applied to the skin before sensor insertion, not over the sensor. Creates a tacky layer that the sensor adhesive bonds to much more strongly. Available as wipes or liquid. Most effective option for severe adhesion issues.
Best for: Users with oily skin, very active users, anyone losing sensors regularly in less than 7 days.
Tegaderm (3M)
A clear medical film dressing that can be cut to size and applied over sensor edges. Very affordable (50-100 sheets for $10-15 at pharmacies). Less pre-shaped than Simpatch but works well for reinforcing lifting edges mid-wear.
Best for: Mid-wear edge reinforcement, budget-conscious users.
Skin Prep Wipes (Smith & Nephew)
Applied to skin before sensor insertion, similar to Skin Tac but gentler. Creates a protective barrier that reduces skin irritation in users who experience redness or rash from CGM adhesives. A good first step if you have sensitive skin.
Sensitive Skin Options
Some users develop reactions to CGM adhesive. Options:
- Apply a thin barrier (Tegaderm) under the sensor with a hole cut out for the needle insertion point
- Cavilon No Sting Barrier film reduces skin reactions without blocking sensor transmission
- Report persistent skin reactions to your care team — sensor site rotation helps
What Not to Do
Do not apply petroleum-based products (Vaseline, most standard lotions) under a sensor — they dissolve adhesive. Do not apply patches over the top center dome of the sensor (where data is transmitted) — this can interfere with signal.