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Nothing new here but I took a couple of pictures and thought some of the newbs here would benefit.
I wet sanded the box to exactly perfectly flush with the board for starters. Then a light 220 sanding around the box.
Some have fretted over laying wet glass over an open slot and having resin drip in. I used to fill the slot with gelatin and fell really cleaver, but lately I've just been laying 4 oz glass pre wetted and scrapped of excess resin. Pic's below.
A light fill coat and some sanding and we are all good.
All the best