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05-25-2019, 10:51 AM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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Proseal
This might sound like a dumb question but here goes. When mixing Proseal, the ratio specified is 100/10 by weight. I can interpret this two ways: (1) 90 grams of part A mixed with 10 grams of part B resulting in 100 grams total or (2) 100 grams of part A mixed with 10 grams of part B resulting in 110 grams total. Which is correct? Before I start, I want to be sure. Thanks.
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05-25-2019, 11:22 AM
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Join Date: Mar 2018
Location: Buena Park, California
Posts: 279
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I think the black stuff is 10% of the white goo. If one scoop of the white goo is 90 grams, the I add 9 grams for the black stuff. I also think there is some minor leeway and the only thing will be affected is the curing time. The seesaws method in Vans instruction has a large amount of error compare to my postal scale.
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RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Started
Avionics Installation -- Bench tested
Firewall Forward -- New engine received !
Electrical -- After engine installation
Donation paid through 2020
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05-25-2019, 11:38 AM
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Join Date: Apr 2015
Location: Vienna, VA
Posts: 61
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FWIW: The instructions that came with my batch say: "10 parts white sealant to 1 part black activator". So, I read the instructions as your item 2. I use a postal scale and if I use 4oz of white goo, I use 0.4oz of the black goo. Hope this helps.
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-Bob "Beagle" Brents
RV-8 (Reserved: N808B sorta like " BOBB")
(Empennage: 95%)
(Wings: 60%)
?To invent an airplane is nothing. To build one is something. To fly is everything.? - Otto Lilienthal
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Dues Happily Paid 2019
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05-25-2019, 12:11 PM
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Join Date: Oct 2014
Location: Sarasota Fl
Posts: 168
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I found the balance to be extremely accurate, I used rollerblade bearings with the pivot just above the boom cg. Very sensitive. No way will I go back to the scale, mine kept resetting and after I started filling the containers and there was no way to set zero again with them half filled.
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05-25-2019, 01:11 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Proseal mix
If you err, do so on the hotter side. I've mixed to 5:1 a few times on non fuel tank parts to get a faster set in the cold. Naca vents. I routinely mixed for the tank closer to 9:1. My shop is cold.
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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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05-27-2019, 06:38 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Volume
I used 10:1 by volume and that gives about a 9:1 by weight. I measured out volume using syringes with the tips cut off. Very easy, very fast.
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05-27-2019, 06:51 PM
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Join Date: Aug 2011
Location: New London, NC (near Charlotte), Boulder, CO
Posts: 271
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Quote:
Originally Posted by Av8torTom
I used 10:1 by volume and that gives about a 9:1 by weight. I measured out volume using syringes with the tips cut off. Very easy, very fast.
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Should be 10:1 by weight. It's very clear in the instructions. I'm guessing it only affects the rate of cure, however. Though many dispute this, I don't think it's critical.
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05-27-2019, 07:51 PM
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Join Date: Jan 2016
Location: longmont, co
Posts: 136
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Syringe
Quote:
Originally Posted by Av8torTom
I used 10:1 by volume and that gives about a 9:1 by weight. I measured out volume using syringes with the tips cut off. Very easy, very fast.
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So how do you get the proseal components in the syringe?
How long can you leave it in the syringe?
Are both syringe s the same size?
I assume (I know that is bad) you measure with the gradations on the syringe, is this correct?
Have you tried to verify the ratio with a scale?
Sorry to be a five year old but I?m curious as this sounds like it might work except for getting those sticky components in a syringe.
Thanks
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05-28-2019, 03:35 PM
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Join Date: Jun 2010
Location: McKinney, TX
Posts: 689
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I used popcicle sticks (from hobby store) to spoon the proseal into the syringe which I got at Tractor Supply company (in the equine section).
The syringe in good for quite awhile, I honstly do not remember leaving proseal in there longer than 20-min or so. If there was any left after a job I tossed the whole thing.
I personally measured evertying by weight. You can get a super cheap digital scale at all the usual online places.
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Gil Brice
McKinney, TX EAA-1246
RV7 - Working on fuse, fuel, brakes etc...
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