Hello hun,
I had to do this for myself for quite a while when I lost my toenail too.
The way I did it is this.....
Took a sculpting form...using the squares on the form, I estimated how wide and how long I would need the nail to be,
Then I checked out the curve on my nail bed to see how curved I would need the toenail to be, to ensure maximum contact with my nail bed.
I then found the correct c curve stick (well as near as I could guess to match the curve on my toenail)
If the nail is a little one though I imagine you could use a pencil or something for this bit.
I wrapped the form around the c-curve stick, and just sculpted a nail on there, following the squares I had estimated earlier.
I did this in clear and just kept all of my toenails painted,
I popped the nail off the form when it was cured, The best thing to do though is to keep the application as smooth as possible, then you will only need to buff over the surface of the acrylic.
Make a few at the same time this way you can hand them to the client to use as replacements if she does lose one.
Then I just applied it to my nail bed with resin.
Mine did stay in place for a long time..I was pleasantly surprised.
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I have found links to my toenail and the acrylic one I made....this was once the nail had started to grow back, but same thing with no nail
BEFORE
http://i21.photobucket.com/albums/b268/emmsybabes/STA40719.jpg
AFTER
http://i21.photobucket.com/albums/b268/emmsybabes/DSC00366.jpg
Your client will love you hun, I was over the moon when I applied my acrylic toenail, I felt "normal" again x