I got a red Gelly pen and a circle template to make the plain tires in the AMT 1967 Oldsmobile 442 kit into redline tires. The red lines came out great, but - THEY AREN'T DRYING. Even after a week the red lines are wet. I've tried sitting them in front of a space heater, blowing warm dry air over them for hours, but they're still wet. Has anyone else had this problem? How did you deal with it? does Gelly EVER dry?!