Gyprock Installation in Sydney At OZ KZ gyprock plaster pty Ltd, we’ve made a commitment to producing the very best in plastering work accompanied by the highest standard of customer service. No job is considered too big or small as our Sydney plasterers can provide a comprehensive plastering solution that will stand the test of time at an affordable price. We understand that finding the right plastering company can be stressful and confusing. Which is why we’ve focused on ensuring that we deliver you peace of mind and simplifying the process by offering a full end-to-end plastering service.