First: Any wing, even molded, can get warped during
manufacture. As you do the work on a Highlander, it
is you who has to correct it! Seldom a worry with EPPs,
as far as my experience (about ten foamies built, as yet),
not worse than with the built-up I have owned!

The strength comes from the glass-fibre tape and the covering - 
you don't need much on top of the tape if you roughen it a bit -
some wash theirs with a mild solvent to get away the wax that is
part and parcel of any rolled up tape (or it would not be possible 
to get it off the roll).

I mainly spray along the trailing and leading edges for the Oracover
to stick and not come unglued! Ultracoat is the same - sometimes
even stamped Oracover on the back side.

If you cover it with glass cloth you have to seal it with a polymer
paint of some sort, or epoxy, and that will weigh even more! I've
tried using only packing tape on Zagis as surface and Oracover -
the latter IS heavier, but you can go easier on the strapping tape,
and the packing tape is easier to apply (Oracover takes some practice). 

If you want scale-like looks go for Oracover and then spray paint it,
to make it look worn and used, or use tape and get flying much sooner!
But you then need more strapping tape ...

And you might end up with a twisted wing which-ever method you use!

Life isn't 100% certain!

And if you're going to slope it the weight doesn't matter one bit -
Mark Mech (Aerofoam) uses sign vinyl for his planes, and that is
one step up from Oracover in heaviness!

Don't forget that there is a product called Oracover light - never used
it myself, but maybe ideal for you? Not as tough as the standard stuff,
but very nice anyway!

Tord,
Sweden

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Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden

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