[pct-l] seam sealing a taped-seam sil-nylon tarp/fly?

[linda.hungerford]

I have a four year old sil-nylon fly that has the seam sealing tape over the 
inside seams.  As I found out in a 6 hour thunderstorm on Mt. Adams this 
week, that tape has separated in a several spots from the fly, and has 
little bubbles where it is about to separate some more.  Does anyone have 
any advice about whether it would be best to apply seam seal on the outside 
seams of the tarp, or go along and try to glue the seam seal tape down on 
the inside on both sides using seam seal?  I'm hoping to use this shelter up 
in the Alpine Lakes next week, so if anyone has some expertise keeping old 
tents going, could you please respond?  Thank you!

linda