Seaport Windows and Doors uses the best materials in the industry with no compromises. We use GRK-coated fasteners, TRIM QUICK white hole plug covers, HILTI insulating foam, NOVAGARD back bead sealant (behind the retrofit), SIKA Polyurethane top out sealant (around the perimeter of the retro fin), and SHERWIN WILLIAMS acrylic latex paintable for interior applications.