If you mean the sort of basins you use to wash in and brush your teeth in, you either need to call a plumber for advice; that advice might be to replace the basin immediately.
No.
Replacing the seal is the only good, permanent way. The seal is old, cracked and leaking.
Failed gasket, seal, plug, cracked housing, etc.
You replace it. It may be possible to have a professional welder weld the crack to seal it up again, but if its cracked then more than likely it got hit hard, and is too bent out of shape to be saved anyway.
Bad Head Gasket or Cracked Block (rare)
You can use gulf wax to seal bottles. If the surface of the bottle is cracked, male sure the surface is dry, and place the wax over the crack, and allow it to try, and that should seal the crack.
Full of mountains and basins
probably your weather seal to your driver side door or your weather seal to your Wind shield do you have just a little rust around it or bubble like rust? is the seal dried up, cracked?
The torque converter may be cracked.
It will make it imossible to start. 2-strokes depends on a tight seal between over- and underside of the piston. A cracked piston will also disintegrate on high revs.
No
rings or a valve seal. Is it blue, then it is oil, white is antifreeze and you'll soon find out if it overheats,(cracked head)