Hey Larry, thanks for the followup on the tire sealant and I’m glad it’s working for you. Based on your good experience I rooted around on the internet and at Walmart found a 16oz Michelin product that’s supposed to do that for CAR tires. (also comes in 20oz too).
So I got one for my rear 180/55 17 tire [with 2#/day leak] (even tho I patched it – not well tho) and put in the sealant Monday and today (after 3 full days) it is holding the appropriate pressure of 42psi.
I am pleased as punch, and from the photo you can see that the 16oz can was only $9.47, Bigger can is $11.54 for bigger car tires.
See photo here https://photos.app.goo.gl/ddpAQyMPcsXg4A2v6