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I've closed both my ES wings and had the popular
over-the-spar-fuel-tank-leak on the first one. I attribute this to two
factors. The first was the pot life of the standard epoxy (I only used Hysol
on the leading and trailing edges on both wings) and the inadequate supply
of mixed epoxy. I solved both problems on the second wing and it closed out
without a hitch. I helped Leighton Mangles close a pair of IVP wings
recently and he used the same method I used on the second wing. Instead of
regurgitating it all here, you can simply go to my web site
(http://www.teleport.com/~peweston) and review the method used there. The
key points are to use a slower curing hardener (Hysol is OK but way too
spendy) and prepare the epoxy for mixing the day before and cool it down.

I help a Glasair builder (please don't spread that around) with his wings a
few weeks ago and the technique he used to weigh down the wing skin over the
spar was quite neat, He laid a strip of expanded polystyrene foam about an
inch thick down the length of the spar, on top of that he laid a 5X1 board
and then placed concrete breeze block on top of that. Worked really well.
The foam conformed to the chord wise curve and thus spread the weight evenly
over the spar.

Keep on sanding.

"Only three short years to go!"
Pat Weston
http://www.teleport.com/~peweston

LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html