I used 2 boxes, same batch nunber, b n q cheap white, never mixed, now one half is whiter, its hard to tell in daylight, but under lights its not hard, once you notice it
Err, umm well I got that wrong then didn’t I probably too much claret last night; for some reason thought the OP was talking about grout; sorry for any confusion.
B&Q will give 90 days unconditional cash refund with receipt on returns & almost indefinite credit without a receipt . I use their local trade store on at least a weekly bassis for all sorts of stuff & they know me by name at the returns counter; it;s never a problem . Most reputable tile companies will also refund returns for a minimum of 30 days; obviously unopened boxes only!
If there is any doubt about the quantity of materials you need or if you think things may change, always buy enough for all eventualities.
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