Duster windshield removal/replacement

Honestly, you should not need any sealants on a gasketed windshield. The rubber gasket itself is the seal.
Sealants are for flush mount windshields.
Most often a shop will use sealants when there are issues with the flange (rust, pits, distortions, sometimes vinyl tops, etc.), are attempting to reuse the old gasket, or they are dealing with an offshore replacement windshield- which often are thinner than originals and don't fit the gasket very well. Or the installer is a rookie.
I'm thinking you may have issues elsewhere- leaking wiper pivot seals, rust in your plenum box (cowl) or windshield channel/flange area, or maybe just plugged cowl drains. I'd hate for you to pay to pull and reinstall the windshield only to still have the original problem.
And if you do decide to have it resealed anyway, and the installer shows up with silicone or anything other than black butyl, send him home.
Silicone is for fishtanks and bathtubs.