Managed to ding the underside of my board today - 2.5 - 3 " gash straight through to the foam

It's just forward of the half way point - I have tried to angle the board so that the ding is the lowest point and stuffed a bit of tissue in the opening to try and aid osmosis - any other tips to try and ensure the board is dry?

Also would you glass fill (UVX type product) straight over it and sand back or cut out the damaged glass and make it a bigger repair - I'm inclined to fill & sand back...