I make a lot of prepreg sheets using glass plates on top and bottom. The prepreg is sandwiched in between and baked in the oven in a vacuum bag. I have an issue with the prepreg surface quality. The epoxy does not cover the whole prepreg sheet and I therefore do not get a flat and glossy finish. Check out the attached picture. You will be able to see the fibers on the surface of the prepreg. The epoxy does in part not cover all the fibers of the prepreg (ref. picture). Here is my question:

Is there a product that I can use to fill those epoxy gaps on a prepreg sheet and make it look smooth and glossy?

Looking forward to hear from you.