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  #1  
Old 01-18-2011, 05:56 PM
Bill_H's Avatar
Bill_H Bill_H is offline
 
Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
Default Help! How Much Pro Seal / Firewall Seal?

A few specific sealant questions - I am working on the fuselage.
Does the Finish Kit (which has the fuel tank parts) include the Proseal (that is, the Van's Part # MC-236-XX) and if so, how much? Quart? If not, how much is needed to build the tank (and fill the top part of the boarding steps)?

What is the Flamemaster Product code for this product, because I think it might be cheaper elsewhere. I can't make it out on the picture on Vans website.

In particular, I may want to order it along with the Firewall Sealant (the CS-1900 - a different product) from here:
http://www.skygeek.com/flamemaster-c...lant-6-oz.html
which is about $20 cheaper than Vans for the firewall sealant. It's not so much the money as I want to get it pretty quick.

It is a bit confusing because the FUEL TANK sealant is used between the lower firewall F-1201C and the F1201-B Firewall Shelf, but later FIREWALL sealant is used on other parts of the firewall.

I am reading other posts about using this stuff but the needed quantity and exact codes are not mentioned. Thanks!
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  #2  
Old 01-18-2011, 06:01 PM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
Default What most of us found - I think

Tank sealant works best for all the areas calling for a sealant. It is messy, but to me is easier to spread out. I think the can is a pint. Been over a year, so might be wrong on that.

John Bender
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  #3  
Old 01-18-2011, 07:01 PM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
Default

Bill,

When the RV-12 kits first came out, they called for two different sealing products. Then they changed to just one, to be used for everything. The product that I ordered from Van's is a one quart kit. I used about 1/2 of it for the tank, firewall sealing, and a few other miscellaneous tasks. It has an expiration date, but I think it will keep for a long time in the fridge.

The label says:

FLAMEMASTER
AMS-S-8802B TYPE 2 Class B-2
CS 3204, SEALING COMPOUND, PART A

Catalyst comes with it in a little jar.

John
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  #4  
Old 01-18-2011, 08:01 PM
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Tony_T Tony_T is offline
 
Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
Default

Quote:
Originally Posted by Bill_H View Post
A few specific sealant questions - I am working on the fuselage.
Does the Finish Kit (which has the fuel tank parts) include the Proseal (that is, the Van's Part # MC-236-XX) and if so, how much? Quart? If not, how much is needed to build the tank (and fill the top part of the boarding steps)?

In particular, I may want to order it along with the Firewall Sealant (the CS-1900 - a different product) from here:
http://www.skygeek.com/flamemaster-c...lant-6-oz.html
which is about $20 cheaper than Vans for the firewall sealant. It's not so much the money as I want to get it pretty quick.

It is a bit confusing because the FUEL TANK sealant is used between the lower firewall F-1201C and the F1201-B Firewall Shelf, but later FIREWALL sealant is used on other parts of the firewall.

I am reading other posts about using this stuff but the needed quantity and exact codes are not mentioned. Thanks!
The finish kit does not include the fuel tank sealant. The 1 quart kit that Van's sells is enough for the entire build with a little left over. Mix it as needed using a gram scale.
It sounds like the plans still call for two different products to be used on the firewall. We are required to build it per the plans.
Van's doesn't overprice anything. Their price includes the $20 hazmat shipping for the firewall sealant, the web price link does not.
Once you mix the firewall sealant sem pak you have to use it up, it does not keep. Bummer, cause the firewall forward plans call for about 1/2 ounce of firewall sealant on the firewall grommet for the engine choke and throttle cables. I wonder how many have spent another $40 for that penetration?

Tony
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  #5  
Old 01-19-2011, 06:23 AM
BigJohn BigJohn is offline
 
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Location: Gloversville, NY
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Default

Hi Tony,

I called Van's support way back when I hit this point and they told me they were now telling people to use the tank stuff on the firewall too. I wonder if they forgot to change the plans.

Meeting my friend with the scales this morning.

John
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  #6  
Old 01-19-2011, 08:13 AM
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MartySantic MartySantic is offline
 
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Default

I believe the plans call for fuel tank sealant for the firewall lap joints and the CS1900 firewall sealant for the larger gaps, punched holes and to fill the bushings where there is more than a metal to metal joint.
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  #7  
Old 01-19-2011, 10:30 AM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
Posts: 686
Default

You might also want to check out SealPak in Wichita, KS. They'll sell you any quantity you need from a few oz to a 55gal drum. Phone works best, 316-942-6211.

They also have the different consistencies... "peanut butter" vice "honey". The "honey" flows out nice to seal the bucked side of the rivets. The "peanut butter" is the more traditional type.

http://sealpakcoinc.com/welcome.htm

-Jim
40603
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  #8  
Old 01-19-2011, 02:39 PM
jte65 jte65 is offline
 
Join Date: Feb 2008
Location: Avon, Indiana
Posts: 341
Default

The plans may still call for the actual firewall sealant in a few places but this has changed back and forth through various revisions and was very hard to track for early builders. After speaking with a few very experienced builders, including some who are A&Ps and have worked for major airlines, the universal recommendation was to use the Pro-seal or an equivalent everywhere and that is what I did. I know there was a thread on this topic early on after the kit came out because the firewall sealant was very difficult to find and Van's stopped selling it for a time due to Hazmat shipping reg changes. Someone indicated the firewall sealant was not fireproof whereas the firewall sealant is. In reality, if there is a fire in the cowling that is really that significant, it is hard to imagine it would make much difference. The firewall sealant is also very difficult and messy to use.

So, like a few others, I used the Flamemaster tank sealant everywhere. I did end up using more than one can (a lot of waste mixing small batches for the tank and other items) and I was hesitant to use it much past the expiration date for anything critical, as the consistency of mine began to change. Note that I also spread a bead on top of all rivet lines on the tank exterior based on a recommendation from someone who runs a builders assistance center. The tank is one place you do not want to skimp- the builders who have had leaks after the initial build seem to have spent many hours trying to locate and stop them. Best to get it well sealed the first time around. I also used a few of the tubes as well- they don't require any measuring, are less messy, and work well for applying beads along joints on the firewall, etc. They also set up a bit more quickly.

Jeff
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Last edited by jte65 : 01-19-2011 at 02:40 PM. Reason: typo
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  #9  
Old 01-20-2011, 04:45 PM
RV12Roger RV12Roger is offline
 
Join Date: Oct 2010
Location: Aguanga, Ca
Posts: 55
Default Expired ProSeal

Van sells "expired" 1 oz packs of ProSeal and ENDORSES it's use for the firewall - NOT FOR THE FUEL TANK. Price is below their cost - $3.00.

Last edited by RV12Roger : 01-20-2011 at 04:53 PM.
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  #10  
Old 05-26-2013, 11:41 AM
cactusman cactusman is offline
 
Join Date: Oct 2012
Posts: 421
Default Which "fireWALL" sealant to use

Ok, so planning ahead and wondering which to use for the few places that calls for firewall sealant vs fuel tank sealant?

I see the following choices:

From ACS...the 3M choice:

http://www.aircraftspruce.com/catalo...l2000caulk.php

From Skygeek....the Flamemaster choice:

http://www.skygeek.com/flamemaster-c...lant-6-oz.html

From Van's....the semkit....rather pricy....

http://www.vansaircraft.com/cgi-bin/...product=cs1900

So what to use? I ordered some ACS 3m stuff based on some other posts but now I am not sure that is "good" enough.

Thoughts?
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