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  #1  
Old 09-22-2015, 02:15 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 535
Default RV-12 fuel tank how much tank sealant required?

About to begin assembling the RV-12s fuel tank. It is one of the newer tanks without the site gauge on the side and has the holes for Moeller fuel gauge and the new fuel tank venting method. Originally, I was considering ordering a handful of the MC-240-B1/2 1 oz kits of fuel tank sealant from the Vans site figuring it could be used on the fuel tank and the remaining kits used on some of the other locations on the RV-12 which require sealant. However, just discovered the one ounce kits only have a 30 minute work time, which surely is not enough time to assemble the whole fuel tank.

I see there is the MC-236-B1/2 Tank sealant in a 3.5 ounce size with a 2 hour pot life and was wondering if anybody has used it to assemble their RV-12 tank? If so, is 3.5 ounces enough material to get the job done and can it be completed within the 2 hour limit?

I dont have a gram scale so do not want to purchase a quart which requires weighing out the material and catalyst.

Comments appreciated ...happy building,
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  #2  
Old 09-22-2015, 02:28 PM
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tomkk tomkk is online now
 
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Location: Port Orange, Fl
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Default

I used the quart kit. I didn't have a gram scale either but got one from Harbor Freight pretty inexpensively. Ended up using the gram scale for other stuff anyway (fibergass mixing, etc.).
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  #3  
Old 09-22-2015, 03:39 PM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,603
Default My experience (s)

The 3 1/2 oz are very good. You will be better off not trying to do it all at one time. Buy 3 of them. 2 for the tank, and one for misc firewall sealant etc. Have used the small ones. Set up too fast for a bigger job. Great for taking front plate off etc. Hope this helps. Others may feel much different. I have done about 4 - 5 tanks ( mine and others ).
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  #4  
Old 09-22-2015, 04:05 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Default

The MC-236-B1/2 (if it is really B1/2) is also a 30 minute work time (the 1/2 means half of an hour).
Sealant labeled B2 is 2 hour work time. I will look into this, the B1/2 might be a typo.
Follow-up - If you order the MC-236-B1/2 you will get a a 2 hr cure sealant. The product was changed at some time in the past, and for reasons I will probably never understand, the part # was left as is from the original. If you order based on the product description, you will get what you want.

A tube of B1/2 sealant might be a challenge for a beginner to avoid having it start to harden up. The last thing you want is to rush for the sake of the sealant and end up with a leak.

As mentioned already, you by small scales real cheap that are more than accurate enough.
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Last edited by rvbuilder2002 : 09-22-2015 at 04:38 PM. Reason: Correction
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  #5  
Old 09-22-2015, 06:55 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 738
Default

Get the quart size and a cheap HF scale. This is really not a big/expensive/complex deal. It's nice not having worry about having sufficient sealant to complete the various sealing jobs. Besides, you will find many useful purposes around the house and shop for the leftover sealant!
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  #6  
Old 09-22-2015, 07:35 PM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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I do not think that fuel tank sealant should be used to seal the firewall. I set on fire some cured sealant with a propane torch. After taking the flame away, the sealant continued to burn. The smoke is not something that you would want in the cockpit. Is there something better to seal the firewall with?
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  #7  
Old 09-22-2015, 07:59 PM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 235
Smile fuel tank sealant

FYI its easer to work on the fuel tank in several steps and time also the sealant is used on the wing tips.
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  #8  
Old 09-22-2015, 09:30 PM
Alex Edwards Alex Edwards is offline
 
Join Date: Feb 2010
Location: Sydney, Australia
Posts: 66
Default

Quote:
Originally Posted by Mich48041 View Post
I do not think that fuel tank sealant should be used to seal the firewall. I set on fire some cured sealant with a propane torch. After taking the flame away, the sealant continued to burn. The smoke is not something that you would want in the cockpit. Is there something better to seal the firewall with?
I suggest that a read of the excellent posts here is a good starting point for selecting a firewall sealant:

http://www.vansairforce.com/communit...778#post549778
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  #9  
Old 09-22-2015, 10:11 PM
DaveWelch DaveWelch is offline
 
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Location: Huntsville, AL
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John,
Add my vote for the Quart Kit and a cheap digital mail scale that measures in ounces and grams. You'll use the proseal in a number of places, it is good for a loooong time if you store it cool, AND it's real handy for other things e.g. shoe repair (just sayin'). And it's so sticky and strong you can impress your friends by suspending an elephant that is glued to a chain with an single drop of the stuff! Kidding! I'm Kidding! Pretty sure it's never been tried. Hmmm...well we are experimenters...
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  #10  
Old 09-23-2015, 08:38 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 535
Default Thanks

Thanks for the input guys . guess an inexpensive gram scale is on the horizon.

I was just trying to avoid purchasing a gram scale because pre-measured is seemingly easier. Plus, I can just hear it now Did you hear about that guy with the pony tail down at hangar 45? Airport security found him with a gram scale and two large bags of white powder. Honest officer, its only micro balloons and flox.
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