Building a TF Corsair .60 and I am for sure going to glass it. But just how much weight does it add ???

It all depends on the material used and application. If you are heavy handed with the resin, then it will weigh more of course. An approximate estimate would be around 4oz per square yard of material when it's all said and done...glass/resin/paint. It will always be heavier than film covering of course. It's not as heavy as some people think though.

Check out some of the other posts by doing a search under "fiberglassing" or "fiberglass."

My estimate is that 'glass and paint would add 2 or more pounds to final weight. I base this on what I have seen. I have built 3 Top Flite Corsairs, each one finished with iron on covering, as well Robart retracts with RoboStruts equipped, and each one came in under 9 lbs. I have met others with simular results. I have also met others who went the 'glass and paint route, and each one of theirs ended up OVER 11 lbs. NOW, I truely believe that a 'glassed and painted one could be built which would be lighter than the ones I have seen, I just haven't seen one yet. If you consider yourself an accomplished/ skilled builder, capable of doing a better job than most others, then maybe you can keep the weight down to the level of the iron on covered ones. Check my gallery for pics of 2 of my Top Flight Corsairs which are covered with iron on covering. #167 weighs 8 lbs, 10 oz without fuel. It has full Robarts and flaps.