Wow! I can’t believe they told you to use that product on the interior. I’m not sure if a polyurethane will stick to it, or stop the odor. Try opening all of the windows and let dry for a week or so to see if it helps. Also, call Dave at Timeless Wood Care Products to see if he has a product that you can apply over the Superdeck. 800-564-2987
You may be able to put a coat of Acrylic Interior over it that Dave has , but I’m not sure if it will stop the smell.