Hi Planesmaker, my comments were based on information I found on Poly Fiber website where popular fabric finished weights were compared.
They include Ceconite, Poly Fibre, Air Teck (and cotton / dope) systems.
Their report on final weights based on covering a complete Cub aircraft were as follows:
Ceconite: 60lb requiring 80 gal of spraying material (12 coats)
Poly Fiber: 60lb requiring 35 gal of spraying material (9 coats)
Air Tech: 85lb requiring 15 gal of spraying material (5 coats) the heaviest as polyurethane paint is used.
The oratex covering I will be using is suitable for aircraft up to 600 kilo in weight - I am well under at 400 kilo.
Oratex weight per square yd is 3.24 oz.
Poly Fiber is 3.1 oz. plus all the coating.
Cheers.