<a href=showthread.php?s=&postid=7867411#post7867411 target=_blank>Originally posted</a> by Ludwigia73
I personally think that you should not repair the crack. HOWEVER, I do believe you should stabilize the crack, because they grow new shell extremely slowly, so a tiny thin repair would just crack again. I'd use some of that 5 minute epoxy, the putty you cut some off and mix it by kneading it into a uniform color. Spread a small bit of it across the crack while holding the shell pieces together. Continue to hold them together underwater until it cures (about 5 minutes, hence the name.) I have some if you need it, but you can buy it at any home depot or lowes for about 5 - 7 bucks.