Post Fix - One Bag is not Enough can I use More?

[japweb16]

The post hole is only about 3/4 full of post fix and I want to fill it with more, only - of course - the new concrete will go on top of the first lot, already rock solid.

Can this be done? Obviously the bond won't be the great, but I think there are adhesives that are supposed to help in a situation like this?

Any advice and product recommendations would be welcome.

Many thanks.

[welsh brickie]

make a wet mix, and just pour it in, it will bond with the old concrete

[FInalFencing]

You can also just use another bag of postcrete. Throw some water in first, then the postscrete and more water. It will set like a bullet and bind to the old stuff.