How do I fix a leak between my sink and plastic drain assembly?

[NedBRowe]

My sink is leaking and the water is coming out between the sink and this plastic drain assembly, what do I need to do to fix it myself?

 

[SHR]

Replace the sink.

 

[phishfood]

Replace the sink.

With a porcelain drop in bowl.

 

[SHEPLMBR]

yuppers