  We report on the fabrication and use of deuterated polyethylene (dPE) as a
coating material for ultra-cold neutron (UCN) storage and transport. The Fermi
potential has been determined to be 214~neV and the wall loss coefficient
$\eta$ is 1.3$\cdot$10$^4$ per wall collision. The coating technique allows for
a wide range of applications and new possibilities in this field of physics. In
particular, flexible and quasi-massless UCN guides with slit-less shutters and
slit-less UCN storage volumes become possible. These properties enable the use
in next-generation measurements of the electric dipole moment of the neutron.
