Drip rail seal kit?

browsing through E-Pray and noticed they sell a drip rail seal for a 65 Barracuda. Its not the bottom window seal, but looks like a roll of thin white bead. How do you apply it? DMT MOPAR 65 Plymouth Barracuda Paint Exterior Gasket Kit Set Body Seals | eBay it was 2 rolls of white thick tape looking stuff. My drip rail seal is cracked and seperating from the roofline, Im sure water will just collect on there one day and start to rust the roofline...if I ever get it out of the garage....