Howdy Folks -
below are some links to a forum that has a wealth of info on anodizing aluminum.
Between neilfj and Jurgenstemmler you will find a plethora of
both theoretical and practical info regarding DIY anodizing.
Just a heads up, For those who may not care for such things,
this is a "gunsmithing" forum site.
anodizing for cats part 1
http://www.homegunsmith.com/cgi-bin/...ST;f=22;t=7407
anodizing for cats part 2
http://www.homegunsmith.com/cgi-bin/...ST;f=22;t=7517
anodizing cast alum
http://www.homegunsmith.com/cgi-bin/...=ST;f=22;t=745
best regards
shunka