Does anyone know why you can't use preseed after it has sat out in the applicator for more than 30 minutes? What happens to it, and why is the rest of the tube fine to sit out? I don't get it. Finally, last time we used it, too much went into the applicator, so I squished it back in the tube (from the applicator, using the plunger). Does that ruin the rest of the tube? :worry: