Entry #3 - a stylish modern looking font, since your technology is futureistic. The blue fragments represent the protective coating and vise versa.
Entry #4 - the same as 3, but with different font.
Entry #5 - A little bit of color play with the place of the coating and the coated element.
Entry #6 - Endura is chromed, cool is blue due to the symbol of cold and cool. The red line around the "enduracool" is your coating, protecting what is under it.