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It has been my general consensus that the only way to make the cracks go away is to take them down to the glass.
I did a limited restoration of my 13' in 95; I used various types of barriers to hide the cracks most cracks came back fairly quick plus using most of the items only exaggerated the crack, they appeared bigger and deeper than before when did come back. I'm restoring again, this time I used a dremel and spent a day gouging each crack and filling. The boat had a wild zebra appearance when I finished but the process went a lot faster than you would think. Though to my dismay, when I flipped the boat it had twice as many cracks on the bottom.