I think if have a least one of every glider Robert has released,
beta test and up. Nearly all of them have been a breeze to build and an absolute joy to fly. I am not a good glider builder, it is and has always been my weakest Mod-roc skill. One of the things Mr. Edmonds will stress, if he doesn't ask the builder to airfoil or taper wings/fins and such;DON'T. I ignored this advice on my first delti, which wouldn't glide at all. Delti's are designed to be flown slab winged, several other kits are also.
Second; don't over finish, decorate with magic markers if you like, sometimes a coat of 50/50 thinned clear on large span wings,
but refrain from priming and painting your gliders. Model plane tissue can be used on some of the larger models and the new Arcie-II with causion. Better yet ask Robert the question directly, I know he lurks here, I'd think if you ask, he'd give you an answer to a specific question.... Ya listening Robert?
Here's what my daughter did to decorate her EC-13's, it flys very well.