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04-20-2017, 05:22 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Vans Flamemaster
The Vans Flamemaster product has built hundreds if not thousands of leak free tanks. Perfectly good product.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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05-02-2017, 07:10 AM
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Join Date: Aug 2005
Posts: 97
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Quote:
Originally Posted by az_gila
Why would the PRC Desoto product be any better than any of the other ones available that meet the Mil Spec?
"...Meets requirements of specifications AMS-S-8802 formerly MIL-S-8802..."
Is it historic or familiarity since the PRC product was the first one generally available for RV tank construction?
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Excellent questions. Mooney specifically authorizes other brands, just calling for the mil. spec. Last I looked, PRC brand was roughly 80-100% more money than Chemseal Flamemaster.
__________________
Kelly McMullen
A&P/IA
EAA Tech Counselor
KCHD
RV-10 40866
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05-02-2017, 08:30 AM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by Sam Buchanan
Fresh, in-date sealant is certainly the best way to go for sealing RV fuel tanks.
However, "pro-seal" remains a very aggressive adhesive for odd jobs for many years if stored in a refrigerator. I have leftover Pro-Seal (may be Flame Master) in the frig at the hangar that is nearly ten years old and I still use it as an adhesive with excellent results. Using the left-over quart kit has been much more convenient for various glue jobs than buying a new batch every time one of these tasks arise. I used it last summer to seal up some oil leaks on an old O-200 and that engine is practically leak free now.
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+1 for this. Have done the same thing.
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05-02-2017, 07:15 PM
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Join Date: Apr 2013
Location: Southeast
Posts: 663
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Thank you for the input. I bought some Proseal from spruce. Is 6 ounces enough to install both fuel floats (quick build wings). Also, I have a tube of Pro seal thats about 3 years old, but its been kept in the refrigerator. Would it be safe to use it to install the front NACA cabin vents.
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05-02-2017, 07:18 PM
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Join Date: Jan 2005
Location: Spring, TX
Posts: 233
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Quote:
Originally Posted by Sam Buchanan
Fresh, in-date sealant is certainly the best way to go for sealing RV fuel tanks.
However, "pro-seal" remains a very aggressive adhesive for odd jobs for many years if stored in a refrigerator. I have leftover Pro-Seal (may be Flame Master) in the frig at the hangar that is nearly ten years old and I still use it as an adhesive with excellent results. Using the left-over quart kit has been much more convenient for various glue jobs than buying a new batch every time one of these tasks arise. I used it last summer to seal up some oil leaks on an old O-200 and that engine is practically leak free now.
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+1 I just used some 15 yr old to seal a cover plate on the firewall. It's been kept in the fridge all that time. That said I just ordered fresh to finish the tanks on my current build. The leftovers will replace the 15 yr old stuff in the fridge.
__________________
Greg
1950 Navion - flying
RV-6 - 18 yrs and 99.5% done
1940 Rearwin Cloudster project next
4 L-2 projects on deck
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05-02-2017, 11:46 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Kellym
Excellent questions. Mooney specifically authorizes other brands, just calling for the mil. spec. Last I looked, PRC brand was roughly 80-100% more money than Chemseal Flamemaster.
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Interestingly the Grumman factory repair kits (for the Tiger/Cheetah) referenced the Mil-spec but supplied the FlameMaster product by part number.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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05-03-2017, 05:11 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Minor detail....
Proseal is often used as an adhesive. For sure, a lot of the adhesive applications don't actually require much strength. That said, it wouldn't be good to overestimate the holding power of polysulfide sealant, which is actually quite low.
Per standards, minimum tensile strength is only 200 psi. Test samples are typically 250~275. It is allowed to drop as low as 50 psi after 14 days in hot fuel.
For comparison, oil-resistant Permatex Ultra Black (aka Loctite 598) silicone sealant is rated at 260 psi per the TDS. 3M FireBarrier 2000 silicone is rated at 350 psi. West System 105 epoxy is 7,900 psi.
Probably the best reason to use proseal as a low strength adhesive? It's paintable.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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05-03-2017, 05:16 AM
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Join Date: Apr 2013
Location: Southeast
Posts: 663
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Dan, is it best to epoxy them on.
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05-03-2017, 05:22 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by az_gila
Why would the PRC Desoto product be any better than any of the other ones available that meet the Mil Spec?
"...Meets requirements of specifications AMS-S-8802 formerly MIL-S-8802..."
Is it historic or familiarity since the PRC product was the first one generally available for RV tank construction?
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I think its obvious, but Just because a product "meets the spec" does not necessarily mean they are all created equal. In my past life working on and around the big birds the only thing I ever recall seeing/using was PRC.
And if I'm not mistaking, most of the "soft gooey sealant" issues that have cropped up over the years on builders tanks that were blamed on the blue dye, were determined to be sealed with flamemaster.
And yes, I choose products based on past performance, familiarity and history, ones that I know work. I do not choose products based on the lowest cost, I have found that you generally get what you pay for.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 05-03-2017 at 05:25 AM.
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