Louise and I launched a SkyTracker and SBS-13 to get a circumnavigation on the books. Unfortunately the sealer recommended is not available and I used what I thought was an equivalent (same specs). It was not equivalent though, and burned a small line in the balloon rather than the wide seal that should have resulted. So SkyTracker and SBS-13 are headed back down already.
Space is hard. :)
-- Michael K5NOT