Thanks, guys. I will feel a lot better once that coat is on. I have plenty of the Steel Flex left, so it won't be a problem. Yeah, I hope my trials and tribulations will help someone after me.
Here is what I learned about applying Steel Flex:
1. Have a good workspace with no wind. The wind was fine and only blew twice, but once at the very beginning, putting debris on everything. I will now keep the stuff shielded by something, or put it in a cardboard box.
2. Although this is clearly stated in the directions and by others on here, mix the pigment in first. This will ensure a proper color and will not increase hardening at all.
3. Work fast, but efficiently. The stuff sets quickly, so mixing a small portion at a time will help out. The only draw back is having to mix the 2 parts more often, which for me, was the worst part.
4. Don't try and pour out the stuff, use something else, like a cup or a ladle (which I will be using for the next coat).
5. Be as precise as possible - measuring them equally is very important, try not to eyeball. Too much hardener, and it will set even more quickly.
6. Try not to backtrack. Put enough on your brush to get it on the boat (or other surface), apply it, and move on. By trying to be perfect, especially with the black, you will get brushstrokes.
7. Don't panic. The more important thing is to seal the boat - and you can always order more or put on another coat.
I hope this helps someone, given that I was freaking out, lol. Oh well. I just need to scuff up the surface again, and reapply. I set myself back, but at least I know it will be fine.