That's a good point. I noticed the epoxy in some areas keeps a 'wet look' after the final wipe in other areas has flashed off. I ended up using the final wipe I had from a few years back and it seems to be the same stuff, only it is in an unbranded container.
I just cleaned out my new gun and I'm waiting for a plus 20C day to lay down more epoxy. I figure I might as well use what's left, but I'm not going to bother with the sealer. To date I haven't had much success spraying anything that was good enough to cover as is.
Thanks for the help!