Size 0 means 4 mm of hair in one series and 12 mm in another. Here is which da Vinci series does what, with the manufacturer’s own measurements.
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I tested two new products, I have on my e-shop. One of them is Magic Potion.

This product is dry colour dissolvent. I had some brushes with its tip torned, so I soaked them in this solution for 24 hours. After that I washed them properly in clear water and applied Magic gel.

This procedure is really easy – soak the brush in the gel and use the napkin to wipe off the excess gel. At the same time I was spinning the tip. Then I let the brush aside. Before painting I just washed the remaining gel with water. Brush tip is just like new again! It works perfectly! Both of the named products you can see here.