I'm not sure if you can spray clearcoat over it...
First of all, a "mechanical" adhesion is needed for clearcoat to stick...meaning the hood has to be sanded with P800-P1000 grit or scuffed before spraying clearcoat.
Secondly, the hood must be wiped with surface cleaner prior to spraying.
The surface cleaner may be solvent based or water based, whatever it is, it will probably remove the sharpie ink. The clearcoat also has some solvent in it which might react with the sharpie ink.