The original windows had been sealed with a silicone based product, and as a result had a nearly impossible to remove residue which would prevent good adhesion for the new windows. I started out with a sharp putty knife scraping as much as possible. I then hit the remainder with some acetone, although it didn't do much at all. Last step was a slow wet sand with 400 grit silicon carbide wet/dry paper. This did a fantastic, albeit very slow, job of removing the residue. In the process it actually did a great job of removing the oxidized gelcoat as well. Bonus!
There's a few tiny, tiny residue spots remaining, but they are pretty easy to find. My next step is to find a way to hold the windows in place and drill the mounting holes, then seal 'em and peel the paper off. I'm so close I can taste it! Unfortunately, another work week is about to begin, and it will be a few days before I can make progress again. I'm getting very nervous about how much I can finish before the cold weather sets in again and stops me for the winter.
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