AHHH did most of the sanding and it feels SMOOTH! Supergluing both halves together and once that's cured it's fibreglass resin time again and Then the final filling and sanding!!!
I tried to sand the rough priming and bits of the primer and filler just fell off, lol
I've put a fresh layer of a different brand of primer on and will see how that reacts tonight, then I guess I'll have to do some spot filling.