Thanks for the excellent advice. Here are links to the planes I am building: a Multiplex Twister and a Multiplex Fun Cub.
Twister
http://www.horizonhobby.com/Products...odID=MPU214222
Fun Cub
http://www.horizonhobby.com/Products...odID=MPU214243
The other plane that I need to cover are two old Mustang 450 kits that consist of a balsa sheeted foam core wing and a balsa fuselage. Here is an old picture attached below. It is a pylon racer that I am converting to electric for use as a sport plane - always loved this plane as a kid.
The twister has a lot of compound curves so I'll have to use the spray adhesive technique them mop up the extra epoxy with paper towels or toilet paper. I really have to keep thins light. I've looked at paper and glue, wbpu and silk/glass, etc. In all cases, guys that done both and compared weights have all said that properly done, glass and epoxy yields the hard and best finish. Even with a lot of wbpu and glass planes, the still look like foam in many cases. There are a few posters that have said epoxy/glass does not work well over foam - any ideas why?