Windshield Gasket Install

When I use to do auto glass for a living we just used windex to help the gasket slide over the lip. No sealers. Once it's in air test with compressed air and more windex. If it bubbles on the inside you can cut the tip small on permetex and pump it in from the front. The main deal is having a clean pinchweld to start. A dirty rusty pinchweld will never seal.