DAMN YOU ANTI ALIASING!!!!DAMN YOU TO HEEEEEEELLLLLLLLLLLLLLL!!!!
I hate how P.NET draws white lines around colors and stuff.But other than that,P.NET is sweet.And these are pretty good.
If flood filling between antialiased lines, set the tolerance to 69%, select the area via the wand tool, then fill the color (backspace) on the layer below.Usually works a lot better.
Or draw on the second layer and colour on the bottom layer that's the way champs do it :P