If the grass is straw coloured it is most likely dead. It’s a common scenario with this product even when apparently applied to the letter of the instructions. Looking at your first set of pictures seems to show where you have applied the product by hand, in particular along your lawn borders. It might be that you’ve over-dosed these areas. I would leave it a while longer but you may we’ll find you’ll need to reseed the affected areas after taking out the dead grass.
Give it a good go with a spring-tined rake which will get rid of the dead grass and create a bed for the seed. Lightly top dress after seeding with something like the Lawn and Turf Dressing from Westland or the like. You’ll need to keep the area moist after seeding for the seeds to germinate. They should show signs of growth about 10 days after.
You might want to overseed the whole lawn as it looks thin. The ground looks compacted and either was wet through the winter or in shade or both. You’ll probably need to undertake some more extensive work (scarifying / aerating etc) in the autumn which is a better time for these tasks. If it is a shady area then choose a seed to suit.
Cheers Dave. I'll give that a go if I get any spells of no rain over weekend. I was certainly intending on doing the whole lawn, for the reasons you've given. Hopefully it'll look ok in a couple of weeks after I run through what you've said.
I'd agree with the suggestion of overdosing. I managed to do this a couple of years ago, and was left not only with blackened areas of dead moss, but with black patches where there had been no moss. The grass should recover quickly, but as no doubt already stated you'll need to reseed in any case to cover any bare patches.
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You might want to overseed the whole lawn as it looks thin. The ground looks compacted and either was wet through the winter or in shade or both. You’ll probably need to undertake some more extensive work (scarifying / aerating etc) in the autumn which is a better time for these tasks. If it is a shady area then choose a seed to suit.