Posted: 31/05/2015 at 12:59
If all you ever want to do from now on is walk on these paths there is no reason why fabric is not a good option. Without it perennial weeds such as docks and dandelions will continue to appear and are deep rooted. Eventually your gravel and the soil will start to mix and you will have an unholy mess that you will find difficult to sort out. Fabric will not mean you are weed free but it will keep the situation manageable.
Cardboard would delay the problem but only for a while.
If you ever wanted to get rid of the paths in the future you could scoop up the gravel, remove the fabric and dig the soil over.
You could use bark instead, over fabric.