Lawnmowing and lawncare is my specialist area so I may be a tad out of date with general horticultural knowledge especially herbicides. That said I'm confused.

We are ocassionally asked to apply weedkiller to paths, patios, driveways etc and with the demise of sodium chlorate have sort alternative treatments. I recently purchased a container of Deadfast weedkiller which was specifically advertised and labelled  as "for paths, drives and wasteland."  Upon reading the instructions this product is simply a spray on systemic contact weedkiller and not a residual herbicide that would both kill existing weeds and prevent further growth over a period of months. I therefore cannot see how Deadfast can be promoted as specifically for hardstanding areas.

I would be interested in members comments and advice on what residual herbicides they use on driveways etc.