What is your opinion of radiator sealants

My Daughter, who does not live close to me and is a single parent, has had this vehicle's radiator "repaired" three years ago and is now leaking. I think the repair was done correctly, but think it is time for her to seriously consider trading for another vehicle with less miles and a more dependable model.

For short term while we shop the market for a dependable car, is it beneficial to use stop leak liquid to buy some time? I would not think twice of using it if there was a leak in the engine block, and we have identifies this leak to the right lower radiator.

Thank you,
Marlin