I use Tamiya Smoke to weather radial engines. It gives the cylinders a nice oily-smokey-used look Here’s a thread on how I do it and it provides some examples.
http://cs.finescale.com/fsm/modeling_subjects/f/2/t/149327.aspx
I have no experience with the Alclad product, but if its anything like their other offerings, its probably fantastic…
Joe