I have heard that ZAP gel works excellent... Narrow tip for precise application, and available @ hobby stores. about 6 bucks an ounce. I believe though for our saltwater application it should be a gel.

Side note: did you know that superglue aka cyanoacrylate was a mistake in the chem lab of a company that developed gun sights ... They were trying to develop a new lense, and found a formula that never cured but was sticky as all get out. Since than it has been used in everytthing from closing lacerations, and inscisions, to our little piece of the pie, in the saltwater aquarium industry. IT saw big time use in the battlefields of Vietnam, and is still used on the battlefronts today.