Core material for strakes??

Adding strakes on a hull, what is the prefered core material for this? Thanks

Anything but Wood, Just kidding I use Corecell but any of the Approved foam cores would work..

Actually, there is nothing wrong with using wood as long as it is bonded well to the hull and covered completely in glass. I have done several from building strakes to extending existing ones in this manner with no failures. I will agree that a foam of some kind would be a great idea as well. What ever you use needs to have some level of flexibility, however, or it will be likely to crack and eventually de-laminate.
Also keep in mind when shaping your cores, to make them undersized so as to leave room for the fiberglass, body filler, and paint or gelcoat in your finished size.