I just put new rear tires on my Scag 48 WB, Carlisle's in the same size (13 650 nhs, I think). N-E-Way, I can't get them to seal and hold air. I put 8 ozs. of Silver Streak tire gunk/sealer in each tire. Aired em up and flat in 3 minutes. I put 8 more ozs. of Silver Streak in each tire. Aired em up and flat in 2 hours. The directions call for 11 ozs. in each tire and it does say it seals bead leaks and puncutres up to 1/4". Yeah right!! I guess I'm gonna try and find some bead sealer/tire glue and try again after work today. Do you guys think this will work or should I try sumpn else? I tried to save a little money by mounting them myself and it looks like I'm gonna spend more trying to seal them than I spent on the tires themselves!!!