speaker cone doping?

I found a wonderful pair of AR-2ax speakers in very good condition at a friends apt used as lamp stands. I have them at the moment and enjoy there ease that it takes to drive them. I noticed the bass drives are made of paper and wondering because of age would it make sense to dope them using a solution of thinned out white glue to stiffen them? Is this mod still being done and wondering will it help the sound in anyway? Thanks