The only rubber bands I use for flight such as holding on a wing I store in a large Ziploc bag with pure talcum powder. I ordered a large container of talc from the pharmacy years ago and just put a little in the Ziploc bag as needed. When I take the bands off I just return them to the bag with the talc. Before I use them I stretch them out and inspect them for cracking and discard the bad ones. I use the same bands to hold wings in place on the rack inside my van and replace them as needed. I have found that if you buy the next size larger and stiffer in bands than recommended they last longer as they are not stretched out near their limit when you use them. Instead of using the recommended #64 bands try the #67. These will also not only be easier to put on but they will put less stress on the trailing edge.

Dennis