Sorry...I hit send before answering the second part. Yes, if you mask well at the bottom, remove the wiper blades, escutcheons and push the wiper turning knobs back inside (tie a piece of string on them to make it easy to pull them back through), you can apply enough to the bottom side. Generally you won't be able to fill the entire space between the pinchweld and rubber. That is unless you get some plastic hose, tape it well to your nozzle and use popsicle sticks to lift the rubber up. If you can do that, you'll be able to push a bunch of sealer under there. If you apply sealer to the area outside the pinchweld and then try to install the windshield and rubber, you'll have a bunch of sealer everywhere...including your hair if you pulled it all out by the time you're finished. No matter what style of sealer you use, that is not a good plan. Years ago there were two tools commonly used. One was a tip that screwed on to the caulking tube. It was curved and had a pliable plastic end piece you stuck under the bottom side of the rubber. It made sealing the bottom edge a walk in the park. One looked like a common oil can and it had at the tip a flat piece about 1/2" wide. Actually it was a flat piece that contained an internal slot through which material was pushed. The material used to seal the rubber to the glass was thin and you squirted it in using this tool. It dried fast so you had to work quickly and you couldn't leave it in the tool. You had to mask the glass so you wouldn't scratch it. I haven't seen either of those in over 30 years and wish I had bought some of them when they were available.
