'69 windshield gasket...two kinds of sealer?

I removed my windshield decades ago to repaint dash frame. I could not find a shop who was willing to reinstall windshield. So I bought new windshield gasket and installed with no sealer. My car sits in a garage. But I have been caught in heavy rain and when I wash car not a drop comes in. My car had drains in bottom of windshield channel going into cowl. I also installed NOS wiper arm pivots years ago too. Just my experience I'll let the experts chime in.