I have not done a fibreglass roof before so was not aware of the quantities of resin etc required. so I used your roof calculator for a 4.75x 3.00 m flat roof and obviously, it said I needed a 15 square metre roof kit. Following your video to bandage the joints of the OSB and the trims and the corners I used 3 square metres of the fibre mat. I then laid out the matting to cut to length before making more resin up to find I am 3 square metres short once you allow for the overlap as well. Your 15 square metre roofing kit contained 15.3m2 of matting which would barely allow for the overlap let alone the bandaging. I have also used 5 litre of resin on the bandaging, and now I'm unsure if I have enough of that. I ordered the 600g matting which obviously takes up more resin. The only reference I can find for the purchase is on the packing slip dated 07/11/2022 is customer copy 100087544. Please advise