Spray sealants make the surface you spray them on hydrophobic. When you wipe the glass, plastic, paint, or whatever you just sprayed the sealant on with a microfiber towel, the absorbent fibers in the towel absorb those hydrophobic properties.
Bead Maker lasts for 3 months, but it is good to top up your protection with every wash. The key words here are “top up”. After you have your initial protection, a little goes a long way.
After washing your car, the next logical step is drying it. So, which option do you choose? Using a blower or a drying towel is a matter of personal preference, each with its own pros and cons, as Levi and Anthony explain in this FAQ video.