even if it was why would it leave the garage? Should never put fresh body work and primer through the elements prior to paint. Any body/paint work is a start to finish job, or your base/clear and entire job months after will hate you for driving it around in primer. Not to mention most basecoats have a time to shoot period after primer is shot and flashed to adhere correctly. IE letting it sit in primer for a month while you save up for base/clear is not good either.
and primer I am talking is NOT the rattle can stuff.
Just saying.