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10-06-2016, 08:15 AM
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Join Date: Mar 2014
Location: Alabama
Posts: 127
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Try craft sticks
I had to pull a rib out leading edge and found that once I got the separation started I could use a craft stick (tongue depressor) in the crack and use it to propagate the separation and occasionally using a razor blade in the gap to cut. MEK also softens the pro-seal and cleans up the residual. Wear thick rubber gloves with the MEK (methyl ethyl ketone), it is not your friend on your skin and use in a well ventilated area per MSDS.
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10-06-2016, 10:07 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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On my RV-3B, I had to remove and replace an end rib in a wing tank. I describe it here and Polygone here.
Dave
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10-13-2016, 03:16 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Ready to re-seal
I have removed tank lid and large fuel sender plate and have cleaned all the mating surfaces. Likewise, I have cleaned and mated the two tank strengthening backup plates. Rivets and screws have all been trial fitted and I have sufficient clecos on hand. I also have rubber gloves, acetone, paper towels, Popsicle sticks, and cell phone in case of emergency. So I?m working up my nerve to mix my Chemseal B2 that is in a 3-1/2 oz. mixing/dispensing tube. I?ve been watching YouTube videos and I?m undecided how to proceed.
I could do this two ways?.
Option #1 Mix entire tube with hand plunger and then use a wooden plug to force the sealant out thru the provided nozzle. Chemseal is fresh and B2 formulation has a 2-hour open time. I think I can install both strengthening plates, then the top plate, and finally the fuel sender plate within the 2-hour allotted time.
Advantages
Assured correct mix ratio and complete mixing
Dispense nozzle should be better than Popsicle sticks
Disadvantage
Need to mix entire tube
Requires hand mixing within the tube
Questions
When mixed will I be able to push material thru nozzle with a wooden plug?
Will I be able to control the bead when pushing by hand?
Will bead dispense shut off when I stop pushing wooden plunger?
Option #2 Somehow cut the tube open and maybe mix three smaller batches to do the job with less time constraint. I have digital gram scale to weigh both components for correct mix ratio.
Advantages
More time to complete job
Disadvantages
Makes a mess
Need to use Popsicle sticks instead of nozzle ? smear instead of bead
Questions
How to cut Chemseal tube open to get to component parts?
How big of a mess am I really going to have?
I?m leaning toward doing the entire job in one sitting. I?d be interested in hearing how others accomplished this?
__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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10-13-2016, 03:25 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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I didn't use the little tube. I have the quart can and mixed up a small batch to do everything but the top and sender/access plate, then later on mixed a larger batch to do those. If you have everything prepped and have a plan, you could probably get it all done in under two hours. It also takes longer to set up and cure if it's cold where you're working.
That said... if you mix the whole thing up, you can put what you don't use immediately in a deep freeze and it will keep for - well, I don't know how long. I saved a little of my second batch in a syringe and put it in the deep freeze. I used some a couple of weeks after mixing it (when I found a small seep) and it was fine. Thaw it out, use what you need, pop it back in the freezer.
That stuff can make a king sized mess. I wouldn't want to try cutting the tube open, sounds like a great way to end up with sealant goo everywhere.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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10-13-2016, 04:29 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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A 35cc syringe from Tractor Supply makes a good applicator.
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Joe Gores
RV-12 Flying
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03-26-2017, 04:54 PM
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Join Date: Jul 2014
Location: Orlando FL
Posts: 74
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How deep a freeze
I recall reading that the builder that worked at Gulfstream said they mix up a whole airplane worth and deep freeze it and pull it out to thaw as the job proceeds.
So now I am in leak fix mode on my tanks and don't need a whole tube. Just a repair and wait quantity. Will the drawer freezer in the house ( chemseal tube in a ziploc bag to stay out of trouble ) do the trick? And how long does it take to thaw?
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Terrell Yon
Orlando FL, KCOI Merritt Island Home airport
140173 Kits Underway
Tail kit structurally complete
Wings in progress
N87TY on hold
EAA 724 and 74 Member
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03-26-2017, 08:06 PM
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Join Date: Jul 2008
Location: kansas
Posts: 330
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Quote:
Originally Posted by TedsNumberOneSon
I recall reading that the builder that worked at Gulfstream said they mix up a whole airplane worth and deep freeze it and pull it out to thaw as the job proceeds.
So now I am in leak fix mode on my tanks and don't need a whole tube. Just a repair and wait quantity. Will the drawer freezer in the house ( chemseal tube in a ziploc bag to stay out of trouble ) do the trick? And how long does it take to thaw?
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Though there are different brands/mixtures, If I recall well, the folks at SealPak (now closed) told me it was about -40f and even at that temperature it was only good for a limited time. No, the home freezer is insufficient to hold off the curing process.
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Larry Vandegrift
ULPower 260is
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03-26-2017, 09:20 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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If it doesn't leak why mess with the tank?
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