I have never seen painted on dots, although I supposed it's possible. The dots I have gotten on Pitbull necks (as well as on other aftermarket necks) are made of plastic and are a fairly cheap in lay.

If you want to replace them, there is a some Youtube and other info on how to do it here:

https://www.buildyourownguitar.com.a...ead.php?t=2584

I have not changed out my dots...but I have thought about it. I actually got as far as purchasing some dots. I stared to drill one out, and it actually popped out before I drilled all the way through it. That was fortuitous, because I realized that the dots I had purchased were less than half as think as the plastic dot I had just removed.

In my case, because I had not drilled all the way through the dot and it had popped out clean, I was able to just turn it over and glue it back in.

Dots generally come in two sizes 6mm and 1/4". The Putbull dots are generally 6mm, I think. If you are committed to changing out the dots, I would wait to purchase your dots until you have popped one out. You want them to be the same depth as the hole or slightly thicker so that you can sand them flat.