How to fill pockets in foam, pre-glassing?

Hey lads, I’m shaping my first poly board here and I’m about ready to glass it (with poly resin) but during the shaping I revealed a pretty good sized air pocket in the foam. I’d like to fill it before glassing but not too sure what’s easiest to use. Was going to just mix some q-cell with white tint with lam resin and bog it up and scrape flat? Or use something else? Thanks in advance.