Gentlemen-
Thanks to you for the guidance above which I have finally put to good use.
The cockpit panels had been covered with a thick marine vinyl that was glued and stapled to the plywood panels. Getting the vinyl off was easy but the glue was tenacious and soft. Any attempt at sanding it off immediately clogged the sand paper. I ended up using an IR heater to really soften the glue and then a sharp pull scraper.

After this the panels could be sanded.
I collected everything heavy I had around and laid out the panels, gooped em' up and laid on the Formica.
Despite your clear instructions I did manage to make a mistake.
Though I used copious amounts of epoxy/cabosil and notched spreader I managed to have a big void.
I fashoned a pastry bag out of a ZipLoc freezer bag and squeezed more epoxy/cabosil into the void while the panel was stood on end to get some help from gravity.
Then I pressed it hard for 12+ hours.
The other panels came out reasonably well and I have faired the the seams where two pieces of Formica met.
I have purchased Interlux Pre-Kote

and Brightside

realizing I am giving up some of the paint quality for the ease of a single part primer and paint to work with.
Any thoughts on how to avoid voids in the future are very welcome as is instruction on the painting phase.
Many thanks and best,
S