The teason we watch is because we all have this issue.

Thanks for making the mistake for us so we know what not to do. You are awesome.

This is the best foam video on YouTube.  I have watched them all and this is the best!

I did this twice on my lawn trailer tires and wasted 2 cans of Great Stuff trying this.  The foam never expanded or solidified.   I contacted the manufacturer and was told that the product needs MOISTURE to work properly.  On my third attempt, I injected about 2 ounces of water into each tire, spun the tires to distribute the water evenly, and then re-injeccted them with Great Stuff.  This worked out very well and gave me great results!  I have not used the trailer yet, as I'm going to give it 2-3 days to cure completely.  The manufacturer was adamant, however, that THIS IS NOT AN APPROVED USE OF THEIR PRODUCT.

Great video, thanks!  I been wondering.

Damn guess im getting  new tires. Thanks for saving me tine and money

Wow we do remember when you did this. Always giving us the best. Thank you for sharing and please keep creating more greatness for us.

I live in Lancaster County, PA. I am sure that an Amish buggy shop could make you a wooden spoked wheel with a steel rim that would NEVER go flat.

I've used foam in a few tires and other projects. You are correct about the foam needing oxygen.
If a liquid to solid is in a tire for example, it will not be fully cured.

Thanks for your video, I was going to fill my tires with foam on my new mower

Open (big air gap) vs closed (small air gap)  cell foam!

I'm glad I didn't foam up everything 😆

I always use Slime. After squirting it in the valve stem, the more you mow, the less it leaks air, until finally it doesn't leak at all. I have used it for years.

I have foamed several tires. However, not on a mower tire. It is on a yard wagon that I have hauled 300 lbs. of deer corn many times. My process is like yours except I drill 1/16" inch holes on the opposite side for air to escape. Let it set up for 24 hours and check for soft spots "voids". Then re-foam the soft spots. I may do this process several times. I ALWAYS use the red can NEVER the blue. The blue never gets hard enough to maintain the shape of the tire.

I think I heard him say do not watch videos of people who want to pump foam in tires?  Or something like that.  Good advice!

I saw a guy put transmission fluid in the tires to seal the cracks

Do you think if you let it set for longer than 12 hours and added moisture into it before you did it it would work better Other tubers do it and seem to have better success?

I reckon if you fill a tyre tube with expanding foam and air it will plug any punctures when they happen.

How about tunes for the tie instead of slime

use loctite foam
you can use foam in damaged upholstry after removing wet foam

Knew a guy in Fairbanks Alaska That put foam in a old quad he kept at a remote cabin. back in 1999. he said it worked. I moved to Kodiak never saw him again.