RE: 1/2 oz or 3/4 oz glass
jimfc3,
I use .60 and/or .75 depending on what my LHS has. I like .60 for all of my 40 and 60 size models I prefer .75 when it comes to my GS warbirds. I'm not sure that it really matters, the cloth is there just to give the resin something to stick to. I just ordered some 1.1 today for my GS Corsair. I decided to try it since I already have 1 done in .75 cloth. I'll weigh them on a digital scale and tell you what the weight difference is.
David