I've got some data on it I'll dig up when I finish building/moving into the new office. When building cored structures out of pre-preg you always use a resin film between the laminate and the core, so you don't wick all the resin out of the inner layers.

If you read the "gumf" from most of the foam suppliers they make a big deal about reduced resin absorption, particularly with new products.

If you're really interested talk to the guys at Gurit I'm sure they'll be able to point you in the right direction.