I 've just used some tile colour enhancer/sealer on some mosaic stone tiles that I have laid before grouting. However I have noticed a kind of window effect on some of the tiles. I have use 3/4 coats. Has anyone any experience with this ? Any advice would be welcome.

what do you mean by "window effect" mate? was it a topical or impregnating sealer you used? personally I seal after grouting to, and I'm wondering if you've sealed some wax from the underlying sheets onto the face of your mosaics

have you rubbed of the excess sealer with a clean,dry cloth?

Its LTP tile sealer and colour enhancer so it seems like a topical product, although it does say it allows the surface to breathe.
When I said window effect, when i put the sealer on it seemed to be wetter around the edges but I had another look tonight now its dry and I cant notice that effect. I did however notice what you said about wax on the surface because some of the mosaics have a brown tint. I guess it must have hapened when I stacked them out of the way before laying them. This was after I had sealed them.

Yes David I did wipe the excess off. Is there a way to remove the wax mark ?
Also, what 's the best way to get rid of grout residue ?