As I did on the last corbels I refinished, I made my own glaze using a grey chalk paint mixed with Saman water based varnish. I literally just brushed it on like I was painting it and then immediately wiped back off using a damp clean rag, careful to leave some pooling in the crevices. As you see, it also leaves color all over the flat surfaces as well. This is what I wanted to happen. If you don't want to leave color all over like that, but only want it in the crevices, you would need to seal your base color (in this case, white) by doing one coat of top coat over it first and allowing that to dry a day or two.
Aren't they pretty! These are available locally to the Moncton, NB area for just $40 for the pair!