Buffing ppg 4000 or 2055

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I usually use 2021 ppg, buts its gotten expensive and hard to find, I have ppg 4000 and some old 2055 thats been on their shelf a few years, how does either buff? I like to wait, a few days to couple weeks, but ive heard 4000 gets too hard after a few days, and have no info on the 2055. Any experience? Please dont tell me about other clears, this is what is available to me…