enamel over enamel wash

Probably. But in any case, don't drag the brush over the model. Don't use the so-called sudge wash. This is a great way to ruin a paint job and decals and ultimately sell more models. Mix your wash, use a fine brush and apply it to panel lines and the base of raised detail. Capillary action will do the rest.The first time I got a successful wash down was in 1983 and rarely even use a barrier between base and wash. I ust make sure the base has had at least a couple days to cure.

In theory, applying a coat of Future (or any other acrylic clear coat) over enamels, then using an enamel wash should have no problems.  The trick is getting a good, solid covering of the clear coat.  If you don't get the clear coat into all of the knooks-and-crannies and then apply the enamel wash, the wash will eat away at the base.  It's happened to me a few times.  I really suggest using either an acrylic base and enamel wash, or enamel base and acrylic wash.  It seems to me from reading about others methods, that most use acrylic bases and oil (enamel) washes.

Jesse