I've not yet done a backfill only rebalances..so have a question....when you do a backfill to replace a white smile line do you then do an overlay of either clear or pink L&P over the whole nail? Also, what if the client has natural tips and you can see the shadow of the natural nail growing...do you just backfill with a natural powder? Must admit the CND natural powder seems more like clear to me, so how do you disguise the shadow of the growing nail underneath?