Leaning fence post repair foam

I saw the bag for the first time on Ask This Old House. Looks like a small bag. Can’t you just pour the excess in a cardboard box and throw away?

Youtube. Starts about 2:25.

Just an FYI update. Upon further review the post was beyond saving so I just dug a hole and placed another post close by. Used the expanding foam and not cement. It’s quick, lite and easy to use. I don’t think I would use it for multiple posts on a 6 ft or taller wooden fence. I’m skeptical on the long term stability it provides. Maybe a 4ft picket, metal fence or just a one post repair like me. Also make sure only dig the hole to the recommended size otherwise you wont have enough foam product to fill the hole and stabilize. Just my 2 cents.

It’s a nice compliment product to use with concrete. Maybe one in concrete and 2 in foam. Wouldn’t use it on corners. But it will definitely give your back a break on large fence. But you have to do it as the instructions say. Too many people try to make the hole smaller and use less.