300/440/550 killer x2 project build

uploaded some more pics, nearly ready for paint....... once i flatten down fibreglass matting and resin! that stuff is some hard ********!
does anyone know whats the best way to fill the hull ive just modified so its smoothe enough for painting? i believe if i fill it with body filler... then it will be prone to falling off cause its porous! any ideas would be great help.
 
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