Sorry I haven't responded earlier, busy weekend out of state and now family here for the Holidays. I'll take your suggestions to use and promptly reply after the work is done. Good idea on routing out the cracks before using Marglass or other fiberglass repair. I think i'll cut a horizontal cut at the end of the cracks to stop the continuation of the cracks. That was a process on virgin metal splits at the assembly plant I used to work at. Either the cracked metal was drilled at the end of the split or cut before being welded, stopping the split for good. Wasn't sure about using body filler to fill pits, considered spraying a fog of resin at low pressure at a distance of about 20 - 24 inches from the surface to allow a fine mist to flow into the pits filling them accordingly. Could this also be an option?