My window was leaking as well (I have a thread about it somewhere on here from over a year ago). I've had the tube of stuff, but work and family and a family medical emergency have kept me from doing anything about it. Because if it I refused to drive it if I thought there was any chance of rain, I didn't wash it anywhere near as much as I should have (in fear of getting water in it), and I haven't even done the recall because I don't think my dealer would keep it from the rain (it's Florida, you never know when it's gonna rain).
Needless to say, there is a great convertible top guy in my town who is going to try the 3M stuff. He said he's tried similar fixes on our cars with little success, but not with that 3M sealant. He's made a "gentleman's agreement" to do what he can, but understandably won't guarantee the work. I know he'll do as good of a job as me and he has a covered garage to keep the car to let it cure, so I figured why not.
I would think that he'd try and mess it up on purpose to get me to have him put a new top on, but he said he can't find anyone who makes tops for our cars and he doesn't do custom tops. He did ask what my contingency plan was if this didn't work and I said "custom top". It's that or sell the car and buy another one. I bought a used top from someone on here and the front had little rips and tears in it. I'm out $750 on that one, so I'm iffy on buying used tops sight unseen from now on. Luckily I found someone to buy it, though for less than I paid, so I'm still out on some cash.
Either way, I can't wait to get my car back and based on the "reviews" of this fix from on the boards, I'm very confident that it will work!