theyomper

Hi, I have some slate flooring to do next week and I have a couple of questions.
I have approx 25 m2 of 200 x 300mm graded Honiston Slate to lay in a dining room. I have layed plenty of slate before but this lot retails at £180 a m2.
Firstly the client wants little or no space, I have suggested a 1mm joint would this be suitable as the slates are spot on for size or would 2 mm be better? Brick pattern BTW.

Secondly I want toget a decent sheen on them and so far trailed one slate with 3 coats of Fila coluor intensifier but I am still not quite happy with the result, can someone recommend any other product?

Thanks in anticipation. the Yomper