the best cure ive found for this is a 50/50 mix of filler and fibreglass resin,grind the cracks right back no matter how deep you have to go,then mix your filler and resin together until they have a consistancy like honey,add your hardener and mix in,then,if your panel is level,just pour it into the pit youve created in the panel until its levelish with the surface,then leave to harden,when its gone off youll be left with a very strong repair that will not shrink(as filler alone may),it will not crack like filler may on a surface that flexes,but,you can flat it with 180 with ease
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