Learning to paint....

Alright, nothing exciting but we're going to try and spray some epoxy primer/sealer (Omni) over the inside of of the car on the new floor and tops of the frame connectors. After which, we'll install the rest of the floor and do it again to cover that as well.

Planning on using the HF purple gun cuz I can toss it if it gunks up. I've already taken it apart and cleaned all the adhesive out of it with lacquer thinner. The tip is 1.4, but it's been suggested to drill it out to 5/64 (1.98mm) for epoxy.

Any suggestions before I pull the trigger, literally?

NOTE: PPE is in place. I'll be wearing a 3M 7502 with 6001 cartridges.
Make sure you have a good gun when you spray the sealer base and clear, otherwise all you work will be for vain.