Need temp.fix, seal until January when I'll replace the whole thing. Replacing gasket might not be possible due to age and state of the whole thing.
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Hello, and welcome to Home Improvement. Use a mess of caulk, and pray? And, you should probably take our tour so you'll know how best to participate here.– Daniel GriscomCommented Oct 18, 2019 at 12:11
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Okay! Thank you. What is " a mess of caulk, and pray"?– Ooh LaLaCommented Oct 18, 2019 at 12:44
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Basically what's described in the answers below (although they don't mention the prayer aspect).– Daniel GriscomCommented Oct 18, 2019 at 15:06
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3 Answers
No great answer for a temp fix. Clean existing seal and surrounding area with a non-abrasive cleaner such as Comet Classic spray-on. 
Be sure to remove any loose bits of rubber or other material around damaged seal before applying caulk.
Apply a generous bead of clear GE Silicone all around existing seal. Using a finger and gentle pressure, smooth the bead of caulk, pressing it into any gap or crevice around the seal.
Make certain you have complete coverage of any and all gaps. One you have applied this silicone, you cannot do a second application, as it will not bond. Remove excess with paper towel and allow 60 minutes minimum before checking efficacy. Be certain to used a new, unexpired tube of silicone caulk. Expired caulk will not cure.
Run water, check for leaking. After the caulk has cured, you may want to tape a short length of toweling all the way around the pipe. An old, clean rag will do. Check and replace toweling if it gets wet.
This won’t be pretty but it should keep the floor dry until you replace the sink and plumbing in January. Good luck.
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Seals shrink over time with age. Therefore I would start by using a rench and tightening up the assembly. You might be done after that. If not the amount of water is that small that you just catch the water and do nothing else. Then I would disassemble the drain which is actually not much work and replace the gaskets. I don't believe that silicon is fixing this without disassembly anyway.
There are also replacement kits available for the complete assembly which don't cost much.
You should be able to slow it down by caulking inside the sink around where the actual drain pipe comes in contact with the sink bowl. that's probably where the water's originating from.
