So, I've gotten some Mastisol to use with Emma's Dexcom - the Dexcom tape lasts only a day or so before pulling off. But I can't seem to figure out how to use it without making a huge mess. It's a spray bottle and when I tried to spray the tape in advance, it wouldn't stick to her arm. So, then I sprayed her arm and tried to wipe the small section where the sensor is inserted, since I was told it would affect the sensor. But the spray was all outside where the tape was and I tried to get the extra sticky that was on her arm, etc. So how do others use Mastisol so it's not a big mess when using it with Dexcom?