nobbie (20/06/2012)

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thanks guys

i actually did both of the suggestions in the end

i got a tin of Spraymax 2k primer , which laid down really smoothly i only had to T cut to bring it to a mirror finish

then i did the PVA the way Fred mentioned after a few coats of wax

and Bob was my uncle a near perfect release. i say near perfect,

 i have two milled 16mm dia flat bottom holes about 5mm deep in the plug which kept hold of the gel coat when i removed the plug from the mould. i may have left the gel coat too long before applying the mould putty i,m not sure, but i now have two 16mm circles in the mould where the putty is exposed and cant think of a way to rectify them........ bummer

thanks again for both suggestions