Hello to all, I'm still at a very early learning stage with composites , but would grateful of some professional advice or guidance to help me along the way.

I'm possibly not the best person to comment as I haven't personally used pre-preg before, but from what I understand, your ramp rate could still be an issue. Ideally you want to ramp temperature up at 1-2 degrees per minute. What oven are you using, just a household one? They won't have the precise temperature control really needed for pre-preg, they are designed to heat up quite quickly. Otherwise, are you leaving your vacuum pump connected for the duration of the cure? Or are you disconnecting it? You may find if you are disconnecting it that you either have a small leak in your bag or you are getting outgassing of solvents that are reducing your vacuum and affecting the finish. 

Hi my friend thankyou for your reply which is very welcome ,

Hi my friend thanks for your reply it is very welcome , I'm going to try and control the ramping via a pid temperature controler' when ive figured out to use it...lol but as for your other advice about the vacume and degassing solvents" I do fortunetly have full vacume all through the cure process but I'm not sure what u mean about the solvents,  anymore info would be appreciated. ...