I need to add weight to my ucd 46 and I took some lead fishing sinker and pounded it to look good to add to my firewall . I mixed up some 5 min. epoxy and added fiberglass shavings for strenght to add strength and glued it to the firewall. Oh yes I did ruff up the both surfaces with sandpaper to hold better . Will this hold good or is there a better way? Thank you in advance . Ken