Napbak & Duracrest Finish
Napbak is a canvak (wax based WR/MR) finish done on canton flannels. The fabric has a soft interior and is useful in making protective outdoor covers for delicate machinery. The soft flannel surface on the inside of the fabric ensures there are no scratches to the surface.
Duracrest Finish is similar to Canvak finish except that the finished fabric is more drier. This finish is preferred for making protective outdoor covers for machinery where a drier fabric is preferred.