Such harsh words from Jake. So lets assume it is the cat version, or even if it is not the answer is the same. Crazing is cause by the gel coat being too thick due gel coat not having any flexabilty while the glass has some. Dremeling and filling will probably result in more of the same. I would recommend taking the gelcoat off completely, or at the very least almost completely. An air file with some 60 grit will do with some effort. In the right hands a belt sander on low speed with some 120 will make quick work of it, but if you are not carefull it will make things very bad in .21 seconds. If you use the belt sander plan to fair the surface out using 3M piranah putty or similar product. You can that paint or regelcoat (my suggestion) after that.