How to solve bleed through on floor?


I have been painting the old board floors in my old house ,all was going well until on one floor after two coats ,I looked and the knots were showing through. I had forgot to seal the knots with sealer it was showing .through.. oh no, so my question is, can I put a light coat of sealer over the bleed spots before painting again?will the sealer show through now? My instinct says to put it on but I dont want to ruin my work as ,my floor paint is very light but not as light as sealer If you can make sense out of my question ,would you help a rookie?

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