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12-16-2016, 05:23 AM
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Join Date: Jun 2005
Posts: 846
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Boomer
You guys be careful to rinse your parts good of any cleaner that's soap as its a release agent.
Bob
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12-16-2016, 07:11 AM
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Join Date: Jul 2007
Location: Cypress, TX
Posts: 526
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I agree with all Sam said except that Variprime is not a two part epoxy. It is a two part self etching primer which adheres extremely well. I clean with thinner before use and a maroon Scotch Brite pad.
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12-16-2016, 08:07 AM
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Join Date: Aug 2009
Location: Newport, RI
Posts: 705
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SEM
Quote:
Originally Posted by majuro15
Give SEM self etching primer a shot if you can get it shipped reasonably. It's a rattle can that goes a long way and is really durable. It's about $20 USD per can, but a lot easier than having to mix and spray then clean equipment. I've found good deals on Amazon.
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SEM is a really great product and worth the money. Dries very fast and is
extremely durable. Great for aluminum, not so on steel. Epoxy primer for steel
And high wear areas.
__________________
Al Girard, Newport, RI
N339AG
RV-9
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12-16-2016, 09:24 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Boomer506
I mix it about 2 parts accelerator to 1 part primer. And will thin a bit more if it thickens in the pot during application, or if I need to stretch it a bit to complete whatever I am priming. For me it seems like the important thing is that it be thin enough to flow out well after the sponge brush stroke, so you don't get any brush marks. Yes, it is a 2 part epoxy, but I have found that over thinning doesn't seem to interfere with curing or durability.
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Careful using more accelerator (DuPont actually calls it a converter) since that is the part that contains the actual acid ingredient - phosphoric acid.
It thickens quickly since a lot of the rest of the converter component is a blend of solvents, and that is probably what overcomes small fingerprint spots you mention in your first post.
It is not an epoxy so extra converter is simply adding more acid and rapidly evaporating solvents to the mix.
__________________
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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12-16-2016, 06:57 PM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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For some parts I have also been sponge brushing primer. I am using the Sherwin Williams Sherwin-Williams CM-0724400 chromate primer. I mixed it at normal spraying strength for the first brush coatings but I will probably try reducing it next time to minimize some issues I had with inconsistent thickness.
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12-19-2016, 05:01 PM
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Join Date: Jul 2015
Location: Europe
Posts: 601
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Is this what I am trying to stop by priming?

Corrosion?
__________________
VAF dues paid for 2020 
RV7-A (N137MX Reserved) - Wings Started...
RV7-A - Rebuild Done - Flying!
Cessna Rocket 210HP - Best dang 172 Ever made! (sold)
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12-19-2016, 05:18 PM
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Join Date: Aug 2014
Location: Bowie MD
Posts: 886
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Looks like filiform to me. To answer your question directly, yes.
__________________
Mani
Busby MustangII (FoldingWing) Pending DAR.
Don't be a hater; I'm a cousin with thin wings! 
N251Y (res)
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12-19-2016, 05:21 PM
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Join Date: Jul 2015
Location: Europe
Posts: 601
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Quote:
Originally Posted by maniago
Looks like filiform to me.
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I am sorry, What does filiform mean?
__________________
VAF dues paid for 2020 
RV7-A (N137MX Reserved) - Wings Started...
RV7-A - Rebuild Done - Flying!
Cessna Rocket 210HP - Best dang 172 Ever made! (sold)
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12-19-2016, 05:44 PM
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Join Date: Aug 2014
Location: Bowie MD
Posts: 886
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Take a quick google on filiform corrosion aluminum. Also take a look at Ch6 of AC43-13 which you can download for free. Its a good treatise corrosion and corrosion mitigation wrt aircraft (just one of the fed works on corrosion) Not the be all and end all, but a good starting point. Doesnt cover some of the ACF, Corrosion X post build type of remediations/mitigations in use these days however.
BTW noone learns about corrosion until they come across it, so dont think youre behind the curve or anything. I didnt know anything until I found some corrosion pits on my wing spars. Then someone else showed me the references and such. Yea for VAF! 
__________________
Mani
Busby MustangII (FoldingWing) Pending DAR.
Don't be a hater; I'm a cousin with thin wings! 
N251Y (res)
Last edited by maniago : 12-19-2016 at 05:59 PM.
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12-20-2016, 11:46 AM
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Join Date: Apr 2014
Location: Stanwood, WA
Posts: 145
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Quote:
Originally Posted by DaAV8R
Sam........do you plan on top coating the Variprime? I have been using Nason self etching primer, a cheaper Dupont primer. It doesn't go on as good but has a similar appearance. I had planned on shooting a finish coat but I like the look of the primer. Just curious what your plans were.
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I do not plan to top coat the variprime inside the airplane, except for the panel, throttle quadrant and C/B and switch panel as shown in the picture. The top coat on those items is DuPont single stage Imron (now called Axalta AF400). The exterior will have a top coat, but I am still not sure how I am going to approach that. The variprime will need to be re-activated somehow. I might just clean/degrease and spray on a second light coat of variprime before the top coat.
__________________
Sam Bovington
Intruder B/N, Stanwood, WA
RV-6 N934B built, flown and sold 
PA-23-150 N2108P restored flown and sold 
RV-8 "Bad Blue" under construction
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