Bed wood coating

[my56chevytruck]

I've been told that this is where to get the answers to my questions concerning my 56 chevy truck bed wood's issues. I bought the pine wood locally and cut it all myself. I've stained the pine wood with a water based Behr stain and am now awaiting it to dry completely, due to living in N.W. Indiana where the weather has been mostly muggy and in the 50's so far. My question I have is can you apply a semi gloss coverage (varnish) over water stain and if so what brand?? I was hoping to do so to give the appearance a slight shine to the wood. I've been told you can't but i thought I'd ask those that have done bed woods for their trucks.

I've posted a picture of the wood. thank you for your help.