priming over tile. I actually also used the zinsser "stain block" oil based primer to paint over furniture wax that had been used to create an antique look on my kitchen cabinets. Valspar paint/primer scratched off easily but Zinsser worked like a charm. Can't recommend it enough for good coverage on hard to paint surfaces. Can be painted with any topcoat - I used semi gloss latex over top.
When I do want to tone down the finished color, I use Valspar Antiquing Glaze, that I buy at Lowes, over the paint before adding any wax to the piece. I feel I have more control over where the color is going to go. If I don’t like it, I can simply wipe the glaze away with a damp rag and start again. Once I like the darkened color, I apply my clear wax finish.