I have used Slime brand since it came out. It is in every ATV/dirt bike tire I have. It has reduced
my trips to the tire shop by a factor of at least 10. I typically puncture 4-5 tires a year. Slime seals
90% of them. But it only lasts about 2 years, so it needs to be renewed then.

 

I use slime and must say that it does a great job of pluging small punctures.....................HOWEVER............. ...........It gives me a NASTY vibration at speeds over 40mph. Luckily I am going to be getting new rims this spring cuz the slime has to come out!!!. I will just start carring a tire repair kit with me

 

I rarely hit 40 mph, let alone go over it, but have never noticed any vibration.

 

I got Berryman at the tractor supply store for about $20 a gallon. It's in 3 tractor tires and 1 Eiger tire. The tractors go over 40 only on a trailer and the Eiger goes over 50 a lot. Never noticed any problems. In fact when I replace the stock dunflops I'll prolly put in all 4 tires.

 

You might try what ive done which is installing tubes and useing slime for tubes. I had a big problem with flats and my tires coming off the rims during racing but since ive put tubes in i can run lower preasure and havent had a flat since. Ive also experianced no vibration problems. Just my 2 cents worth.