In terms of extra gloss and added protection, yes, adding a second coat is always beneficial. What this will do is build up more of a physical barrier to the elements and further level the optical finish to make paintwork appear even deeper and glossier. A wax layer that’s double the thickness will proportionally increase these characteristics making it a great way of getting your paintwork to look its absolute best - essentially adding more warmth and depth - which is a great pro-tip for show cars and other pampered vehicles. So, why not just add a single thick layer in the first place? Well, it’s because the wax has to bond to the surface, and only the thin layer that makes contact with your paintwork can successfully bond. Laying on a thick application simply means that you’ll be buffing off most of the wax - all the wax that hasn’t bonded - wasting your car wax, and your cash. Conversely, once that first layer has cured, another thin layer can easily bond on top of the original wax layer, building up the protection and shine. With our Signature Hard Waxes, just half a turn in the tin with a Waxmate XL or Wax Spot Pad is more than enough for a whole large panel, and the goal is always to get your wax on there as thinly and evenly as possible, while ensuring complete coverage. We recommend leaving the vehicle for 3-4 hours for a hard wax to cure (or 2 hours when using Radiance Carnauba Crème, which is classed as a liquid wax) before adding your second coat. For more on wax application, and some top tips for the most effective surface preparation, see our full guide – Getting The Most From A Hard Wax.