Color bleeding on V carves

[dehrlich]

I have this problem frequently on signs that I do V carve lettering and graphics on. Mostly happens on the softer woods, pine, poplar but sometimes maple. I'm guessing it's the fibers getting torn and allowing the color to leach in, surely there is a way to fix it? I always spray shellac on prior to the paint to seal it but maybe I need to do more? More sanding just makes it worse most times. Any help is appreciated.