I use to use Joy but stopped about 4/5 yrs ago when my Hoosier tire supplier told me I didn't need to use it anymore, that Hoosiers didn't leak thru the side walls anymore. My 16X33 have been fine. I also got a set of 16.5X33 M/T slicks from a guy that were test tires with 5 or 6 passes on them. I put almost 90 passes on them, they were dry and never leaked either. So maybe ask your tire mfg if you need to use it today with your type and size slicks. RM