Can a wax be put on top of a sealer?
Yes, but wax is soft and creates a high maintenance finish. It will show scratches easily and require reapplication weekly. For a better way to achieve the same look, see:
Sometimes, despite your diligent research and the best of intentions of your suppliers salesperson, you might have been given the wrong information. Therefore, no matter how confident you are, whether first time user or seasoned professional, it just makes good sense to patch test a small area and evaluate the results in a few hours before doing a large area.