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Dian chi definitely does make the sponge softer if you apply it correctly. Also, if your familiar with the Haifu oil that the Chinese national team was supposedly using before, dian chi is actually an improvement of that oil (in terms of performance). The created of Dian Chi broke off from haifu and made his own product which is Dian Chi.
In terms of Bio Booster, I couldn't say which is better since I've never used Bio Booster. I would guess each one is better for a different type of rubber. I can only recommend dian chi based on my personal experience.
In terms of Bio Booster, I couldn't say which is better since I've never used Bio Booster. I would guess each one is better for a different type of rubber. I can only recommend dian chi based on my personal experience.