How to Get Resin Off of Deck Foam?

Finished laming the bottom first. Taped the underside deck but some resin got by. How to remove? Surform then sandpaper? Want to keep the deck white so…

The trick is to sand it off while it’s still wet/tacky. As the sandpaper gets gummed up immediately, all you have to do is keep using a new swab of sandpaper. It goes away quite fast.