Try the industrial strength Velcro. Home Depot has it. It takes a little while for the glue on the backing to set tight, a day or so, but it holds like iron once set. It comes in fifteen foot rolls so you might want to get a few guys together. It isn't cheap, but definitely worth it. Strenghten any balsa you are going to stick it to by CAing the area first.

I quit wraping my RX or battery pack once I went to Velcro.