The sworn enemies of Libre sensors are door frames. It is far too easy to knock the back of your arm against a door frame without noticing it. It is not just household door frames, the door column in a car can be a worse sensor killer worse than a door frame in a building. Women report that bra straps are also sensor removers.
There are ways to guard against these sensor killers.
Some people find that the adhesive on the sensor does not stick to their skin type and so they use products like Skin Tac to make their skin more sticky. Abbott recommends that if you want additional protection you should cover it with a Tegaderm patch (these are typically used to cover cannulas and often they are used to cover newly applied tattoos). The Tegaderm patch increases the area stuck to the skin and protects against knocks. Tegaderm is water resistant, but daily showers will make it start to peal, so expect a Tegaderm patch to remain stuck for seven days.
If the Tegaderm patch needs replacing before the sensor has finished then you have to be careful to remove it and not dislodge the sensor. It helps, therefore, that before you apply the Tegaderm you put a 30mm disc on the patch in the place that would otherwise stick to the sensor. The paper gets between the patch and sensor, so that when you remove the patch you do not pull off the sensor.
There is a market on ebay for 30cm sticky patches that can be used to cover the sensor with a customised image. If you use Tegaderm then you can create your owe design on a 30mm circle and print it out using a colour printer.
Some people use adhesive muscle binding Rock Tape, or cohesive tape (which only sticks to itself). These are not on the list of recommended products from Abbott, but users report that they do not affect the sensor. Other people have more complicated solutions with 3D laser printed frames attached to an arm band. If you find an arm band comfortable then these may be helpful.
Libre User 