Wow, that doesn't look good. I also tried the dye prep. It made my leather a shade darker then without the prep. Otherwise I didn't see any difference. I don't know how big a piece of leather you are working with. Try putting prep. on your whole piece, brush it in with a small brush, wipe off excess and dye while it is still wet with the prep. I wouldn't do it with a large piece of leather, I wouldn't take the chance. I only used it on belts. I called Fiebings, they told me to dye while it was still wet. If you put the prep. down and let it dry, that might be the problem.Good luck, do a test piece.
Jim