Yesterday I finished off a job replacing a gully to add channel drainage on the driveway. The area we dug up (around 2m²) was topped off with 5cm (2") of cold lay asphalt laid in 2x 2.5cm (1") stages. For each stage the asphalt was rammed down hard using a handheld tamper.
The end result is quite a porous asphalt. A lot more noticeably porous than the rest of the driveway which will have been laid with hot asphalt. I'm in the north of England and the freeze-thaw cycle is consistent. I don't want this new patch of asphalt to start breaking up after only a few years.
Is there a technique to finish off cold lay asphalt/tarmac which fills in that porosity?