Experimenting with hair's barette

I had put some pebeo vitrail emerald paint on one barette (http://www.amazon.ca/Pebeo-Vitrail-45-Milliliter-Fabricant-Couleurs/dp/B00M7HNP8I/ref=sr_1_4?ie=UTF8&qid=1440946849&sr=8-4&keywords=pebeo+emerald).  It lead me to wonder if nail polish could do the same on a barette.  I took the Hard Candy.  I think it is the bitty blue or the touch of teal color.(http://www.hardcandy.com/beauty-nails/hc-nails-bitty-blue/)(http://www.hardcandy.com/beauty-nails/b_4_nails-touch-teal/)

Here is the result, with two photos, on the barettes:

I added a varnish on them all.  It is an water based varnish (http://www.amazon.ca/Water-Based-Varnish-3-Ounces-Gloss/dp/B004RR9H6K/ref=sr_1_80?s=kitchen&ie=UTF8&qid=1440945999&sr=1-80&keywords=gloss+varnish).  I don't know if it will hold on,  It is an experimentation.  I may add another varnish but I don't have any other than the one I just mentioned.  I think to try the barettes as they are right now and maybe add another coat of varnish if needed.  It will give me time to shop for other varnishes.