Pro-Seal issues

[Ron Shannon]

The saga of my leaking right tank continues. For the worst remaining
rivet, neither Loctite 609 or Seal-All would do the trick when applied
with internal vacuum suction, so after lengthy cogitation, I decided
to try replacing the rivet. I drilled the rivet head off and gently
pushed the tail back up into the (springy) Pro-Seal inside, where it
remains. Am now intending to pump a bunch of Pro-Seal into the rivet
hole before replacing the tank rivet. I haven't worked with the
dreaded Pro-Seal before (didn't build the tanks) and have a couple
questions:


1) I have an (expensive but) unopened quart that has an expiration
date of 9/01/10. It's been stored in relatively cool temps. Do I dare
use it, or should I cough up the big bucks to get a fresh supply?

2) Any tips for measuring and mixing small batches? Per the can, I
gather the ratio is approx. 0.8 accelerator to 10 sealant, and per the
manual, it can be thinned with MEK if necessary.

3) My plan is to apply internal vacuum in the tank, and push as much
Pro-Seal as I can into the rivet hole from the outside using a small
suction cup. Any other ideas for methods to press it into a rivet
hole?

4) Per Wayne's earlier comments about not cracking the shop end, I'll
probably pull the new tank rivet by hand, after slobbering it with the
goop, of course.


I realize that pushing the rivet tail up into the existing Pro-Seal
carries the risk of opening more separation between sealant and metal,
but at this point it's really coming down to this tactic -- or cutting
football-sized access ports to redo the whole thing.


Ron
254R

PS - Sucking Loctite 609 into the seeps worked great on the left tank,
so it's still a viable method for others to start with.



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[Ralph Baker]

Pro Seal is much more than a tank sealant and a way to forever stain clothing. It is also a sophisticated method of determining how serious you are about building a wet wing aircraft.
Ralph Baker



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[wayne.pederson]

A better fix would be to order some of these rivets from McMaster-Carr
(97524A103 Sealing Blind Rivet Domed, Alum/STL, 5/32" Dia,.063"-.125"
Material Thk, Packs of 100) and drilled it out and put in this next size rivet
with pro-seal as stated



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