Prepping for Varnishing Cockpit

Before the summer gets too far along, I have to varnish the cockpit of our MC16.5.  I applied 6 oz. 'glass under 2 coats of epoxy to the entire area so the weave is not entirely filled and there is a nice texture that I want to maintain for a bit of traction.  How should I go about prepping the area?  I thought I would just sand it and then varnish...but with the texture, sanding won't be entirely complete with the slight dimples in the 'glass...will the varnish adhere adequately?

Thanks

Chris

Cockpit Texture

what i just learned about varnishing the cockpit is that when you go to glue in the foam seat,  the contact cement and the varnish do not play nice together.  i just scraped up a bunch of varnish that bubbled and peeled from the cockpit. i know i cannot be the first person to do this, what a suprise!