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  #11  
Old 10-06-2016, 08:15 AM
BenNabors BenNabors is offline
 
Join Date: Mar 2014
Location: Alabama
Posts: 110
Default 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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  #12  
Old 10-06-2016, 10:07 AM
David Paule David Paule is online now
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,007
Default

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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  #13  
Old 10-13-2016, 03:16 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 515
Default 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 Im working up my nerve to mix my Chemseal B2 that is in a 3-1/2 oz. mixing/dispensing tube. Ive been watching YouTube videos and Im 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?

Im leaning toward doing the entire job in one sitting. Id be interested in hearing how others accomplished this
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J3-Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 213
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  #14  
Old 10-13-2016, 03:25 PM
DaleB's Avatar
DaleB DaleB is online now
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,505
Default

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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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #15  
Old 10-13-2016, 04:29 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,399
Default

A 35cc syringe from Tractor Supply makes a good applicator.
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Joe Gores
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  #16  
Old 03-26-2017, 04:54 PM
TedsNumberOneSon TedsNumberOneSon is offline
 
Join Date: Jul 2014
Location: Orlando FL
Posts: 73
Default 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
Ailerons Flaps and Fuel Tanks in progress
N87TY on hold
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Paid Jul 15 -Jun 16
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  #17  
Old 03-26-2017, 08:06 PM
skydiverlv skydiverlv is offline
 
Join Date: Jul 2008
Location: kansas
Posts: 258
Default

Quote:
Originally Posted by TedsNumberOneSon View Post
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?
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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ULPower 260is, dual ECUs, dual 30 amp alternators
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  #18  
Old 03-26-2017, 09:20 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 1,949
Default

If it doesn't leak why mess with the tank?
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