Welding Zinc Primer. Weld-through primers are generally a zinc-based product that is applied to the mating surfaces prior to welding. Weld through primers are zinc-based products some may be copper-based but that is rarer that are applied directly on your metal material surfaces before you begin your welding project.
Page 1 of 2 - Which Weld Through Zinc Primer - posted in Bodywork Paint and Detailing. Also with regard to the new panels. I do alot of industrial railings and structural things of this nature.
This versatile primer can be applied to any metal surface and will provide a zinc coating and will prevent the formation of rust and corrosion during extended periods of time.
Ive been spraying rustoleum through a my quart cup gun for years and I have to thin it 65 paint and 35 laquer thinner. Its advantages over the previously used PVB. Absolutely NOT for use on the inside of enclosed panels. If the zinc primer is organic eg epoxy zinc moisture cured urethane zinc it must be removed prior to welding otherwise the quality of the weld will be jeopardized as indicated above.