My First Mopar- 1966 Barracuda project

Thanks! I have a Schutz gun that came with the Raptor liner years ago when I sprayed my S10 bed. It screws on to the bottle. It was much easier to spray top side and vertical than upside down, but managed to get the Barracuda underside covered. Ruined some clothes from the overspray falling but I’m happy with how it turned out. Been on a bit of a hiatus after the Hurricanes here but the weather has been great and I should be getting back to it soon.
Do you recall how much material it took to spray the entire interior floor pan by chance? I'm considering using Raptor liner on rearward portion of my interior (rear firewall, package tray, floor pan, etc). I may just buy the 1 gallon kit so I have extra for other stuff as well. It looks like great stuff!