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+1 to what banderson said.
On lower quality and used caps you at a minimum should have a cap tester that can check for leakage at full rated voltage. On some things (usually radios or certain TVs that I feel have close to zero market value) I'll use used or cheap caps. I use the tester to check to check iffy stuff before install, and I even do that for new reputable/reputably sourced cap brands for a while after I start using them.
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