My father owned a sealant company. Industrial, commercial. I spent many numbing hours wandering the warehouse while he worked, memorizing the names and properties of products: Dynazip 25 one-part polyurethane sealant, moisture curing, effective on highways, reservoirs and sewage treatment facilities; the gun-grade, multi-component polys of the Merix series; Portex 400 ultra-low modulus silicon bridge sealant; the Spexxo line of custom sealants, including highly adhesive blended elastomer compounds, non-hardening synthetic rubbers such as Zoxit 90, paintable acrylic latex suitable for acoustic treatments, Lithik 1000 solvent-releasing high-solids seal for construction joints, and Evagica synthetic-rubber-and-resin compound gutter seal; Trumlo 67 (and Trumlo 67 Plus) low-mod, one-part, traffic-grade silicone sealants for highways and parking structures; CoZeel neutral-cure silicone for curtain window wall systems; FTW 500, FTW 550 and FTW 600 one-part, acetoxy silicone for sealing bathrooms, locker rooms and spas; and X-Alta no-mess poly foam to seal against the wind-driven rain: pre-compressed, self-expanding, self-imposing and self-aware.