The answer is minimum 43.2 tons annually. Yes, don’t be surprised.
How ?? Our calculation as follows:
If the coating speed is 100 meter/min,
if working width is 1000 mm and
If extra coating 1 gsm, then
100 meter/min *60 min *24 hours *1 meter * 1 gsm = 144000 g = 144 kgs per day

Further more,
144 kgs *25 days = 3600 kgs per month
3600 kgs *12 months =43200 kgs per year

The final answer is 43.2 tons annually free materials for your customer, if extra coated 1 gsm;
Of cause, if extra coated 2 gsm is 86.4 tons glue wastage.

When you supplied the tape with 1 gsm extra coated, the customer will be not appreciated, but if less coating for 1 gsm, you will get a lot of complain.

So, how the tolerance of coating thickness on your exist coating line ?