In the last week of October, workers began to apply the final blue coat. This took about five hours, and was followed quickly by a clear coat to seal it and add shine. PPG Aerospace donated all paint for the tack, blue, and clear coats. This required an ordinary paint gun to fill seams and fissures around patched locations, as seen on the vertical stabilizer; then an electrostatic paint gun that reduces over-spraying, an environmentally sensitive and economical method of painting airplanes. There was plenty of prep work first, including covering the canopy and tires with tape and coating the walls and floor of the hangar with plastic.