This is a request for info on the possible similar experience of other LNC2 builder-fliers... a wing tank fuel leak.

The very slow leak through the front wing spar, when fuel leveel is above about half way up, is of course uninspectable because of the leading edge -- and further because it is possibly behind the root area secondary web ... not to mention the fact that the spar web is sandwich construction and the interior skin leak can propagate spanwise to another portal in the forward web skin.

So my question is, when I slosh-seal the tank, what is recommended as a prep for the tank inner surface?
I've read MEK and another TankPrep stuff.

For sealant I've looked at PR-1005-L, and at the automotive (supposedly) stuff, and  phenol novolac.
Any suggestions soulfully appreciated, for this worrisome job.
Thanks.

terrence N211AL
LNC2 235/320.