Cert. useful for traveling educators, 4 letters
1938 DuPont invention, 6 letters
Accidental discovery of 1938, 6 letters
Coating accidentally invented in 1938, 6 letters
Fabric protection brand, 6 letters
Impervious to blame, 6 letters
Non-stick pan coating, 6 letters
Nonstick cookware coating, 6 letters
Nonstick pan surface, 6 letters
Nonstick skillet surface, 6 letters
Polytetrafluoroethylene, familiarly, 6 letters
Slippery discovery of 1938, 6 letters
Start of a slippery nickname for John Gotti, 6 letters
Gotti's tabloid sobriquet, 9 letters
John Gotti nickname, with The, 9 letters
John Gotti's nickname, with the [United Kingdom], 9 letters
Slick observation, part two, 15 letters