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Pole setting expanding foam.
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Previously:
https://www.homemadetools.net/forum/...162#post141533
https://www.homemadetools.net/forum/...306#post126907
Sika post fix is a two-part, pre-proportioned polyurethane resin which when mixed produces an expanding foam. It has been specifically formulated and packaged to provide a lightweight, mix-in-the-bag, and fast-setting backfill for wooden, PVC and steel in-ground supports.
A 2-component, pre-proportioned polyurethane resin that produces an expanding foam for supporting mail box or gate posts
Suitable for all types of posts including wood, steel and PVC
Lightweight pouch replaces two 50-lb bags of post mix
No water or special tools needed
Sets in 3 minutes and cures in 2 hours
4 x 4 and 6 x 6 posts require 2 bags.
About $13 bucks bag at the big boxes
In reality, the quantity depends on the depth of the hole and the difference size between the post and the hole, not the size of the post.
The stuff does look fun, but is way too expensive for me.
I've used this product to put up a flag pole. At 75 years old, it was a lot easier than using cement with the weight and mixing required.
I like the weight concrete adds towards holding it down.
And sure, it has to be a LOT cheaper to beat a bag of post hole quality ready mix