One of the very first things I did when I bought my brand new MacGregor 26M was to paint the bilges with white Gelcoat, that was 8 years ago and still no flaking. The bilges were raw fiberglass with sharp shards sticking out waiting to impale the first unsuspecting hands. I sanded all the areas to be painted with a very rough sandpaper then vacuumed out all the dust, cleaned and then painted. I can now store things in those ares and see that they are clean and when they do get dirty I simply wipe all the white gelcoat surface clean with Fantastic spray. IMHO it shows pride of ownership and if I ever sell a potential buyer will see that the boat has had TLC's.