After getting the cowl halves fitting together like they should. I always hold them together with masking tape on the outside, (all the way around). Then, take a few drops of medium CA to the seams on the inside to make sure it stays in place. Then, I'll take a 1/2" wide piece of fiberglass cloth & resin it completely around the inside on the seam ( make sure you rough up where the glass goes.) This will make it super strong & won't add weight to speak of. Good luck