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I found this article from Kemet (now Yageo-Kemet) about capacitor reforming.

[URL unfurl="true"]https://www.kemet.com/content/dam/kemet/lightning/documents/ec-content/Aluminum-Electrolytics-and-Applied-Power.pdf[/URL]

Besides confirming the advantage of already suggested slow reforming method (gradual voltage increase or current limiting) it addresses two points not yet mentioned:

- different capacitor series have different aging characteristics and therefore different reforming requirements

- a main risc of abrupt reforming is brought up by involved hydrogen production