I don't know about you but I really hate paying $160 per set of tennis shoes. That is what it costs to get a pair of Brooks Beast running shoes in 4E width in my size. I was going through two pairs a summer during my busiest teaching phase. It wasn't just that I wore the sole out but that the upper fabric tended to look dirty after a while. I tried going with some low cost good looking leather/faux leather uppers just for groups lessons since they looked good and I didn't have to run and I went through three or four of them per year and got almost no support. They only looked good.
So now I'm going back in time to my days of playing when younger and even $30 shoes were a challenge so I resorted to Shoe Goo to keep them going. Especially when on the practice court this is a viable way to extend the use of your shoes. I may even try to launder the shoes first to clean them and brighten the uppers.
Here is a photo of the job. I'll be using these on the practice court and day to day walking since the Brooks Beast is the ultimate support shoe for an over-pronater with wide feet. When I started using them it changed and extended my life on the court.
Wear nitrile gloves to keep the goo off your hands and do the job outside to avoid fumes. I let them dry outside too.