yes, that can is from a basecoat, meant to have a clearcoat applied no tellin what the po did about clear, and I couldn't say how you can determine, but a bodyshop prolly could tell
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics