Second flat on the rearGatorskin. I found a puncture on the tube, but no corresponding object in the tire. Don't think it was a snakebite flat since the tire was well inflated when I started riding to work this am. But when I started my ride home, the tire was thoroughly deflated. Fortunately there is a bike shop two blocks from my office, where I can fix a flat in comfort. I bought 2 oz of Bontrager tubeless tire sealant and put a little of it into the patched tube, then installed the valve core and went on my way. How much should I put in when I get home - 1 oz per tire?

I'm not sure why I'm having this bad luck with flatting. Two punctures in a month for a brand new puncture resistant tire seems odd. Maybe I just have bad karma this month.

EDIT: after further investigation in the garage, I'm not going to count this second puncture against the tire, because I can find no penetration of the tire, and the hole was right on the tube seam. It is possible I have a bad tube. Anyway, I put 1 oz sealant in the tube and we'll see what happens.