the tank 15 to take up material therefrom conveniently the tank 15 is raised or lowered so as to bring the coating material 16 into contact with the belt 17 for the time being existing on the rollers 12 13 14 the extent of movement being such as to cause the lower part 18 of the belt 17 to become immersed in the coating material 16 or simply to engage the surface 19 thereof according to the nature of the coating step required in the arrangement illustrated three rollers are provided two such rollers 12 13 being arranged at a common level and serving to support the fabric 11 belt 17 and the third roller 14 being at a lower level and being after the nature of a guide roller to locate the lower part of the fabric belt at least one of the upper rollers 12 13 is driven so as to progress the fabric belt about the roller arrangement the process steps are shown in fig1 and comprise in succession dip coating steps fig1 b to 1e a lick coating step fig1 f and 1g two dip coating steps fig1 h to 1k and a further lick coating step fig1 l and 1m each step including.