: The only problem you'll likely have is you can't sand kevlar without it
: making a mess, it all fuzzes up and won't lay flat. Getting a decent bond
: without sanding is the trick.

While you can't sand Kevlar, you can scrape it with a sharp scraper. I prefer carbide scrapers for working with composites, as they hold an edge well.

There is no problem with gelcoat bonding to Kevlar.