Abstract: Sprayable aliphatic polyurea-polyurethane coating compositions and methods are disclosed. A quasi-prepolymer composition is prepared by mixing an aliphatic polyisocyanate with a stoichiometrically deficient quantity of polyol such that substantially all of the available hydroxyl groups of the polyol react with the isocyanate groups of the aliphatic polyisocyanate. Suitable catalysts may be used to accelerate the urethane bonding in the quasi-prepolymer compositon. The polymeric coating is preferably formed by reacting the quasi-prepolymer composition with a low molecular weight or a mixture of low and high molecular weight amine terminated polyether compounds. The amine terminated polyether compounds have amine groups capable of reacting with the unreacted isocyanate groups of the quasi-prepolymerMixing of the quasi-prepolymer composition and the amine terminated polyether is preferably done at a sufficiently fast rate of result in a substantially homogeneous product.

Abstract: The automatic wire puller of the present invention provides an apparatus allowing one electrician to pull wire through conduit sections. The wire puller employs standard fish tape reels, is directly mountable to an electric outlet box and provides a reversible drive motor for playout or take up of the fish tape. A releasable catch maintains the handle of the standard plastic fish tape reel in a stationary position during rotation of the reel holder. The invention includes a first torque sensor to disable the drive motor should the fish tape become snagged during take up and a second torque sensor to deactivate the motor if the fish tape becomes snagged during playout thereby preventing damage to the fish tape, the wire being pulled, or the conduit which could occur if continued force was applied to the snagged fish tape. A completion sensor releases the handle of the fish tape reel when take up is complete and a shut off sensor then disengages the motor drive.