Yes, many daylilies are forever at rest with them trying to be converted. If the chemicals are mixed properly and administered properly then the chemicals shouldn't kill the daylily. From what I've read if the growing tip gets smothered with the outer remnants of foliage it can rot, if the growing tip grows out and does not open properly it can cause rot, if you touch it you can get germs on it from your hands and cause rot or other disease
Here is some photos from Bill Waldrops blog http://billwaldropdaylilies.co... that shows some of the process. If you go there either key in conversion/s in the search box or just scroll through old posts. Or just google daylily conversion and you will see several links to Bill's blog about different conversions he's done/doing.
The first 2 photos show how much you cut off the daylily
the 3rd photo is with the chemicals applied. Bill adds red food coloring to it so he can see it better and make sure it gets absorbed.
The 4th photo shows how the foliage begins to grow. If this doesn't open up it can cause rot. Sometimes you have to help it along and cut it open.