The Chain Mixer: A Viable Alternative to the Mixing Blade?

About 3 weeks ago, I ran across this interesting DIY video of a chain mixer created by a guy named Bill. (I know his name and web address because he contacted us via e-mail after I commented on the video). We’ve mixed a lot (and I mean A LOT) of stuff for the basement project, including basement water proofer and self-leveling underlayment. I wonder how this device would have faired...