typical wing sheeting is 1/16 to 3/32 .
you can call it skinning cloth if you like but its "fiberglass" cloth, typical weight used in modeling is between .5 to.75 oz, that is the weight for a sq.ft. of material,it is woven glass fibers in varring weights depending on application,modeling,surfboards,boats.
if it was done a while ago it was probably done with west systems epoxy for the resin or a similar type of material used as the bonding agent.
a popular method now is using water based polyurathane as the resin,but your plane is old enough that its likely done with epoxy.
petrol=gasoline; used for automobiles, and model planes,gas is what you get when you eat a burrito with beans