I have a handcart with tubeless tires. One of the tires has developed a
leak in the sidewall. It goes completely flat in about a day. (I wish
they had used a solid rubber tire.)

What is the best way to repair this tire? Would one of those liquid
tire sealants work? Thank you in advance for all replies.
--
I am TERRIBLY cruel to my cat. I tease him with a vine tendril
until he either jumps up in the air to bat at it or zooms around
in a circle until he gets too dizzy to stand up. What is cruel about
it is that I don't do it nearly as much as he wants me to.