Thanks for reply, frame by frame correction is the best but longest way.
I Did a 50% correction directly in FCPX with Color correction/ color mask and shape mask decreasing the exposure value on highlights (white spots and stains), looks better now.
Hi again.
First Thing I thought was to create a cut in the final movie and insert the new part in it directly in Adobe encore but that way the movie maybe dosent rewind to the beginning.
The Preview files are the way I worked in the past but for some reason I stopped using it, I will return to that way in order to save time for long movies I am making nowadays. There is always something to change.