We recommend that you do not have a previous coating of wax on the car prior to applying any car polish. You won’t harm your car’s finish by applying Nu Finish® over a coating of wax. In order to achieve maximum results, a polish or wax needs to adhere directly to the paint. Applying a product over the pre-existing coating of wax will not allow the polish or wax to work properly. Carnauba wax breaks down relatively quickly so once the surface is clear of a coating of wax, you will be able to apply Nu Finish® Car Polish to achieve your best results.