The solvent's inability to dissolve or absorb into the polycyanoacrylate, along with the polycyanoacrylate's high glass transition temperature, means that the polymer stays where it was created in that solvent. As Primer A molecules initiate polymerization and chain formation, a solid polymer gel forms within the dilute monomer solution of Primer B. That polymer retains much of its molecular-scale structure even as the solvent dissipates and it becomes a xerogel—a porous solid that forms when a gel's liquid phase is allowed to evaporate from liquid to gas [11]. Firmly rooted in the silicone rubber on which it formed and rich with nanostructure to which adhesives can bind, this solid polymer xerogel is an excellent primer coating.