My intent was to apply some concrete patch onto the cracks in an existing concrete driveway. I had cleaned the cracks out & pressure washed it to both remove dirt / loose material and to saturate the concrete with water.
I then brushed on the Concrete Bonding Agent straight from the bottle and mixed the proper amount of it (for that I read the mixing directions) into the concrete patching material then applied it onto the old concrete.
After setting for a day - I brushed more of the Concrete Bonding Agent on top of the newly placed patch.
Then I read the directions.....
They said - "Do not apply Concrete Bonding agent straight onto existing concrete - but instead blend it into the concrete mixture". ACK!!
Any idea why they say not to apply it directly onto the existing concrete?
I could see they want it mixed in the new concrete mixture to give it more strength or to bond better to the old concrete (and I did do that).
My (theory) was that by brushing it directly onto the existing concrete it might help 'bond' the new concrete onto the older concrete better.
As to why I brushed it on top of the new concrete - well I thought maybe it would form a seal of sorts....