PRESSURE AND TIME
Think weeks and days, not minutes and hours.
This is essentially the leave-it-between-two-large-books-for-a-long-time-and-hope-that-fixes-it way. If you have some large and heavy books to cover the record you’re trying to flatten, this method will serve you well. Constant pressure should flatten your LP into submission, but it will take a lot of time to really make a difference. Be careful you aren’t doing something more destructive in the process, like adding a ton of weight to a dirty record and grinding a grain of sand into the surface. Clean your record first and consider leaving the record in the inner sleeve when putting it between your books–that should help prevent dust building up on any part left uncovered.
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