This is a slow drain, not a seal problem

Why this happens

A worn seal lets water out too fast. A clog does the opposite and slows the water down. Bob Vila says that when both sides of a double sink are stopped up, the clog is likely in the trap, and that for a double sink with only one side clogged you block the clear side with its stopper or a wet rag before you plunge.

How to fix it

1. If dirty water or sewage has come up out of any drain, tub, shower or toilet in the house, stop using water and call a plumber now. This Old House says continuing to use water can push more wastewater into already blocked pipes.
2. Open the slow sink drain troubleshooter linked below. It starts by checking whether this is the only slow drain in the house.
3. If a chemical drain cleaner has gone down this sink, do not plunge, snake or take the drain apart. Family Handyman says caustic chemicals pose a danger to anyone who takes the trap apart, and that plunging after them can cause skin burns.
4. Bob Vila says that on a double sink you should block the clear bowl with its stopper or a wet rag before plunging the clogged side.

When to stop. If a chemical drain cleaner has gone down this sink, do not plunge or take the drain apart. Call a plumber and say what you used. If dirty water comes up from any drain, stop using water and call a plumber.

Start this troubleshooter over

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