I want to add some type of slime to my utv tires.

What kind?

I most run hard ground with a few cactus and mesquite.

Gempler ultra seal

https://gemplers.com/collections/ultraseal

I have had good luck with Multi-seal Pro-HD 2500 but it expensive and can be hard to find in some areas. I have switched to Berrymans Tire Seal-R and it has worked very well. I used it in South Texas for all the thorns there and in West Texas for mesquite and greasewood. It is available in a lot of places.

I have used Slime and Berymans. Both have done well for me.

Seems people in Mesquite country like Gemplers.
I've always used Slime.

Which of the 3 Gemplers is go to ?

I use bullet on my mule, commercial on my trailer tires

https://www.tireject.com/

Best stuff I've found. Plugs leaks from mesquite and cactus as well as any of them, and doesn't throw the tires out of balance like the others.

$30/gallon slime from tractor supply has worked very well in my SXS, 4-wheelers, and mowers on my place and all of those tires are plumb full of big mesquite thorns and I've not added air to any of them in the last 4 months.

For the money it works well.

I put about a quart per tire in my atvs.

I ordered some gemplers

Tireject has worked great for me as well, and multi seal has too. Green slime didn't cut it.

Love it.

Had a really slow leak on one of my Ranger tires.

Installed the TireJect this weekend. Little pricey, so I wanted to test it on one tire first.

Fingers crossed it work. Very simple stuff.

Slime works