Interesting to find this post. I've been looking for a good price on Devcon 10110 and waiting until I needed some other tooling so I could combine shipping. Now I need to do a a repair on an AR15 lower so I need some Aluminum Putty, 10610. So I pulled the spec sheets and they are very close but the Al doesn't rust. strength and shrinkage aren't significantly differnt. I like the darker color of the steel but oh well. The Aluminum is lighter. Aluminum is more expensive. but I'm going to order some and give it a try.
--jerry