Start at r3 3 line, used 34 of 35. If my memory serves me right I used 1 Credne for 3 lines, originally 2 lines.
By experience it's almost identical to Fines, when it comes to weapons I always used up an average of 20 to 30 Fines to hit r1 from r3. So the outcome is the same compare to Fines but the 34th roll may or may not be the effect of the Refined. I usually end up buying another 20 to 35 Fines to get the roll that I wanted.
It might be too early to judge since I only bought 35 and only reforge one weapon, but by comparison on obtaining ranks to other weapons that I reforged, the outcome is identical to Fines.
Luckiest reforge I ever had is my two Ele ESbeams, I only used 3 Credne and 12 Fines for both of them to obtain Ele 3 and Ele 2+2.

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