It hard to tell if those cracks are from paint & then stress or if that was in the mold & then gel coated over... if you sand the top to paint then those impurities will make there way back thru the paint. Lots of molds have these issues from lots of use and being moved around... the only way to fix this is sand down to fiber glass use a structural filler & repaint. That can be costly I’d suggest sanding the effected area and use some fiber glass resin to fill the crack using a Qtip ( break off the fluffy part & just use the stick) then use a paint pin to make it match should hold up well.
2004 E350 EB Quigley - aka MCSporty6.0
2013 Fiat 500 pop/abarth - Sold
2003 Land Rover Disco II
1997 E350 7.3l 2wd - Sold