Reply To: Read More button with handcrafted excerpt

Maybe this can help?
http://wpatch.com/how-to-add-a-read-more-link-to-genesis-child-theme-excerpts/

Or this:
http://appfinite.com/topic/readmore-link-for-excerpts-as-well-as-content-limit/#post-11759

Last one and some css worked for me. 😉