Co-flex? is this the same as Co-ban?
If so get it at the farm supply store, it is used to wrap horse tails etc. and it comes in colors.
Some of the guys wrap this over the foam over their battery and receiver packs.

A layer of foam around a fuse then wrap with Coban or ace wrap might help conforming to concave shapes.
I am a home health nurse and I bet there is 10 rolls of that stuff in my work car

I also like to use sand bags. I got a 5 gal bucket of sand and use baggies in diferent sizes, they conform to shapes well. Sand bags for wing sheeting was my prefered method until I made a vacuum press.