Kframe, engine bay, front suspension questions

Okay picked up some high build aerosol from same company(Dominion Sure Seal) as the Self Etching primer. Removed all surface rust, primed and topped with high build. I'll sand with 320 and then 400. Any tricks?
Also how to go about the spray bombing?
Start at top of firewall from one side to the other? Sorry for newbie questions, hoping for as good of results within reason lol.
3 in 1 is the high build

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