I only do one coat but that is because I have a good base on there already. There is no fixed firm method to spraying the bed. I kinda just dust the area I am going to print it. Sorta like I am spraying air freshener but with a target in mind.
My bed I always have at 100C but my extruder temp varies depending on the filament. This natural filament that I am running now seems to flow really well at 215 but I have some dark colors that don't work at anything less than 225-230. I am also running a different hotend so my temps don't translate too well.
SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.