Thanks, I used you tube a lot. Best I found was a guy with page "Foam and Lizards" he has some interesting videos..
So grouting is now complete, I applied 2 coats and on the second went over with the brush and some water to smooth out as much as possible.
At the moment the texture is quite rough and although once painted and sealed it should be nice and smooth I am slightly concerned about the frogs finding it too rough
Background has also have the substrate mix/peat applied, this was done by applying silicone sealant to the foam and then covering. A tip here is to cut the foam back enough to make it reasonably flat, this makes the application of the peat much easier.
First coat of paint is also applied (my wife is doing this as she is much better at it than I am!)
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