Deck coating??

[fillet1]

MJ-

A power washer would make easy work of any loose paint for you. scuff up whats left, wipe down and paint away.

Victore - I would remove the tank hatch and paint it separately.
If not, you will end up with unsupported gaps under the coating at the hatch seams. Plus, if you ever have to open that hatch, you wont have to cut and ruin the coating!