Ben wants to enjoy the total eclipse but all the glasses are sold out. So he's looking at welding glasses, but can't find 14 grade lenses. Can he stack two 8 grade lenses together? Leo says he doesn't think that they are additive and it won't work that way. It's certainly not worth taking the risk. The best place to find out what to wear is the NASA Eclipse Website.
The chatroom found this thread that talks about whether or not it's safe to stack welders glasses to watch the eclipse. Even if it were safe, the image quality would be poor. He could just photograph it through a smartphone safely. That way he can watch it.