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The best thing to do is replace the boards. If the OTHER side looks good (w/no knots or anything), use that. What I'd do is take up all the 'bad boards' and look them all over and see which is the best one to go where you sit.
My best to ya and hope this helps.
Jay J -Moderator
PS: Sealing them is temporary until, one day, a friend/family member sits on the bad board and is walking around with a bulls-eye on their behind. In short, sealing the board is only a temporary solution ...