I would add this advice, also.
Get an extra tube of Seam seal, and practice applying it on some other fabric. As you mentioned, seam-sealing the MLD mitt isn't easy!
Watching a video on how to do it will not help as much as you'd like, either, hehe. We, of the owning-MLD-mitt club, can attest to that.
Love my mitts, hated seam-sealing them.