Having my little trips out of the way I'm back home to finish off the bits (and see the family as well).
By now, the base will have dried solid and running your fingers over it should not dislodge any 'grit' - if it does do not worry, the next few stages will sort out any semi-loose bits.
First water down some more PVA glue abut 30% water I find right and flood all the brown grit area again making sure any holes are filled in. To help you may want to add a few drops of washing up liquid (but no foam folks) and ready the flock. I use an upturned shoe box lid but a large sheet of paper work fine. Note do not do this with cats, a cold or any young children within 2 miles unless you have a hoover ready...
Once wet, bury the strip in the flock and push well down into the glue:

Note the flock is half way up the hedge in the above photo. A quick shake will dislodge any loose hairs - do not rub the base - just tidy up the edges by running a finger around them and clear the bottom off. Now leave
OVERNIGHT to dry.
Next day, tap any loose bits off and run your fingers up and down. Try not to create bare patches. You may be surprised by the amount coming off

The next stage requires Woodland Scenics Scenic cement. This is the only liquid I have found that works for this (sorry folks) and it is like runny milk and contains water, PVA and something else but I have no idea what from the smell. Using either a dropper or fine spray, flood the grass till it goes white and carefully wipe the bottom off before setting down on a plastic bag to dry


Do not do this when going out or to bed - you need to move the strips for a couple of hours while the glue dries - let it stick and you have real problems. After an hour or so, I wipe the bottoms again (seem to have this thing for bottoms in the post) and move them onto an upturned lid or box to reduce surface contact.
Now once these are dry you can use them as is but you may find the green a little bright / artificial. To cure this I dry brush dark green, black and browns onto the fence and hedge, edge the base with black then protect with a matt varnish. The finished item looks like this

With a little bit of care, you can create simple gates and broken fences

(I will try to get some better photos taken - the mobile is just not clear enough as only the last picture is clear enough to expand)