Venetian Plaster Specchio Black Cera WaxSPECCHIO CERA WAX Mirror Glossy Black wax . Comes in a tin size 500g Yield is 10 12. 5m2 This can be used on Polished finishes, as well as other marmorino products. Good for Riflesso and stucco antico Application Process: This is applied with a sponge or cloth, use sparingly, depending on the product you are using, you apply and leave around 20minutes and buff up using a lambswool bonnet.