Primatesta was born in Capilla del Señor, Exaltación de la Cruz, province of Buenos Aires. He was ordained priest in 1942 and elected titular bishop of Tanais and appointed auxiliary bishop of La Plata on June 14, 1957 and became its vicar general.
Primatesta was born in Capilla del Señor, Exaltación de la Cruz, Buenos Aires province. He ordained as a priest in 1942 and later became titular bishop of Tanais and auxiliary bishop of La Plata on June 14, 1957, taking on the role of vicar general.