Yeah two important items.
1. Get ALL the excess out. You have to keep rotating the tank and draining off the excess. For me there was a little lip that made it extra hard to get it all out. If you leave any excess, it will puddle, the top will dry first. This creates a sink over liquid sealant, trapping in the solvents, it it will cause a pealing adhesion problem
2. Heat, for the same reason as above. I did mine in the winter and thought I needed to warm up the garage to help dry. I got the tank too warm, this made the material dry too fast, trapping in solvent under a dry skin. You want the sealant to dry at the correct rate.
Both of these points are covered in the instructions, you just have to actually listen. Heh
https://www.kbs-coatings.com/tank-sealer-directions.html