Schjssj,

Your subject line indicated Coverite, your text indicates Coverlite. I'm not familiar with coverlite, but I have used Super Coverite over sheeted surfaces. I did NOT prep with balsarite but if you must, I'd probably use it in the areas where raw fuel might get to.
I painted over it with a sandable primer to mostly fill the weave, and then a few top coats of color. With heat and/or time, some spots have lifted, but I was able to flatten/re-adhere them by simply applying heat with an iron (not so hot that the paint softens mind you).

If it were me, I'd use Coverite (if I had any left- it's now discontinued or hard to get) or Solartex on any surfaces that were suposed to be fabric covered on the full size, and use 3/4 oz glass cloth/epoxy laminating resin on the fuse and the wing, stab and fin if they are fully sheeted parts.

-E