When a hammer doesnt work, try dragging a quarter or fender washer over the surface!
Was the void in the skin or between the skin and core? Doesnt matter much anymore just curious.
Just leave a sacrificial 6" of glass on the top and masking tape it to the hull. Flip it up, and spread a lil thickened stuff down, let it tack a little, then wet it out with plain resin and flip glass back down.
Dont wipe with anything, just blow all the dust out with a fine tip compressed air blower held right at the surface at an angle. Whatever microscopic stuff that remains will emulsify into the goo...
Even in 78degrees id be blending slow and tropical for a layup that size.
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