Not sure what this is saying. Once it has been sould glazed we have to put more materia on it or can redo the materia already put on?

One you have completed the quest “Mmmmmm, Soulglazed Relics,” you will be able to alter the materia-enhanced properties of your relic weapon novus or relic weapon nexus. Prepare a new sphere scroll of the correct type to receive the power of your chosen relic weapon, then use materia and alexandrite to redo the infusion process.