sorry mate was getting a wee mixed up heavy night last night lolyou want artex combs then by the sounds of it any pics
if you greese the (floral artex pattern) be for taking the mould it will not stick to it the greese will act like a barrier to prevent adesion.
I understand what your saying GDS,but he has never attempted this before ,so it is unlikely that he will get a proper reverse mould from something that intricate.