The uniformity of a wet coating on a substrate is improved by contacting
the coating at a first position with the wetted surfaces of periodic
pick-and-place devices, and re-contacting the coating with such wetted
surfaces at positions on the substrate that are different from the first
position and not periodically related to one another with respect to
their distance from the first position. A coating is applied to a
substrate by applying an uneven wet coating, contacting the coating at a
first position with the wetted surfaces of periodic pick-and-place
devices, and re-contacting the coating with such wetted surfaces at
positions on the substrate that are different from the first position and
not periodically related to one another with respect to their distance
from the first position. These methods can provide extremely uniform
coatings and extremely thin coatings, at very high rates of speed. The
coatings can be applied in lanes with sharply defined edges and
independently adjustable coating calipers. The pick-and-place devices
facilitate drying and reduce the sensitivity of drying ovens to coating
caliper surges. Equipment to carry out these methods is simple to
construct, set up and operate, and can easily be adjusted to alter
coating thickness and compensate for coating variation.