When the body was bare metal it was dipped up to about the top of the lower door hinge (look inside your rocker/kick panels, you'll see the line). The car was then baked which is why there are hardened drips hanging under the floor pan and dried wrinkled pooled up stuff in the grooves of the top sides of the floor pan and trunk floor. After that it was primed and painted. The blackout painted rockers, radiator core support, and finally undercoating was applied last.