There was an article on processing of submerged handguns in a relatively recent issue of Evidence Technology Magazine vol. 9 number 5. The article can be found at http://www.evidencemagazine.com/index.p ... iew&id=658
There a link at the top to the to the online version of the magazine. In quickly glancing through it, it looks as if they processed the guns with "Wetprint", then fried them with a heat gun, then CA. You may be able to get one of the authors to share more info.