I recommend you replace your cap with the same voltage rating. Electrolyitcs like to be operated close to their rated voltage.
A converse is not a negative. This is a widely documented design recommendation. If you want to do this ( not recomended ) the following procedure should be used: Connected the capacitor to a power supply set to 80-90% of its rated voltage. Use a 30K series resistor to limit current. Operate the power supply for 5 minutes. Then you can disconnect the cap and install it.
For over thirty years I have worked on the assumption that the working voltage of a cap is a maximum and that you could always go up but never down.
As things do change, I decided to do some research into what the manufacturers say, to make sure I am still doing the right thing.
I checked the websites of four manufacturers, Elna, Rubycon, NIC and Teapo. Reading through the cautionary notes from all of these, there is nothing about the working voltage except to say do not exceed it.
Brownout, you say this is well documented. Can you point me in the right direction to find this documentation?