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  #31  
Old 08-17-2016, 12:11 PM
Boomer506 Boomer506 is offline
 
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Location: Stanwood, WA
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I have been applying primer with a sponge brush and it seems quick, easy and inexpensive. I mix it thin so if flows out well and doesn't leave brush marks. Dupont Variprime seems to work well for me. It is a metal etch primer, and has zinc chromate in it. I still scotch bright and clean with a good detergent. But even if the parts are not super clean, and have a oily fingerprint or two on them, the metal etch primer cuts right through and gives me good adhesion. I like the idea of having a good primed surface where parts are touching.

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Intruder B/N, Stanwood, WA
RV-6 N934B built, flown and sold
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  #32  
Old 08-17-2016, 12:20 PM
rv9builder rv9builder is offline
 
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Interesting idea, Boomer. How did you figure out how much to thin it for sponge brush application?

Thanks,
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  #33  
Old 08-17-2016, 01:39 PM
Boomer506 Boomer506 is offline
 
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Location: Stanwood, WA
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I am able to use the same sponge brush and the same small plastic mixing cup repeatedly. I open the Dupont Variprime can and stir with large wooden popsickle stick, then transfer the primer by dipping the stir stick and scrapping on the sides of the mixing cup until I get the amount I think I will need. It is often a very small amount for small parts. When I transfer by stir stick, and not pouring, I avoid contaminating the rim of the can with primer so the lid will go back on cleanly. Then I poor activating agent in, generally about twice the amount of primer by volume, and stir with same transfer stir stick. You can sort of tell if the mixing ratio is correct by the way it flows off the sponge brush and not leave any brush marks. If has been sitting awhile and dried/thickened a bit, I will often splash a little more activator in the mixing cup to thin it out again. I am a cheap skate by nature and the waste product. After I finish priming my parts, I splash some lacquer thinner in the mixing cup, swish around with my sponge brush to clean both the brush and cup. I will sometimes use a heat gun to speed drying so I can flip my parts more quickly. I can prime parts and be ready to rivet in about 15 minutes. Yes, I am not following the mixing instructions on the can, but I don't think this stuff catalyzes in the same way that epoxy paint does, and mixing thin doesn't seem to degrade durability.
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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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  #34  
Old 08-23-2016, 10:59 AM
SabreFlyr SabreFlyr is offline
 
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Location: Marion, IN
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Sam, your method seems like a good compromise between rattle can and HVLP spray of a two-part epoxy primer. I'm intrigued. How long have you been using this method? I'm really asking how old are the oldest parts on which you've used this technique and do they still look the same as the ones you've done most recently?
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  #35  
Old 08-25-2016, 12:58 PM
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FL-flyer FL-flyer is offline
 
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Location: Sarasota, FL
Posts: 38
Question Priming rivets

Quick question guys. Since most of the internal priming work needs to be done prior to assembly, once the parts are finally riveted together, the rivets themselves miss out on getting any primer. My question is, do I need to go back after assembly and re-spray over all the bare rivets? Not sure now corrosion proof rivets are.

Thanks,
Casey
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  #36  
Old 08-25-2016, 09:19 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Rivets

Quote:
Originally Posted by FL-flyer View Post
Quick question guys. Since most of the internal priming work needs to be done prior to assembly, once the parts are finally riveted together, the rivets themselves miss out on getting any primer. My question is, do I need to go back after assembly and re-spray over all the bare rivets? Not sure now corrosion proof rivets are.

Thanks,
Casey
Rivets are treated. No spray needed.
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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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  #37  
Old 08-26-2016, 12:48 AM
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FL-flyer FL-flyer is offline
 
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Thanks Larry, good to know!
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Sarasota, FL
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Starting on empennage section - August 2016
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  #38  
Old 09-08-2016, 12:12 AM
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FL-flyer FL-flyer is offline
 
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Location: Sarasota, FL
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Just wanted to share something I read in the plans on primers. Looks like Vans actually has a short list of some specific primers that they recommend are superior (Sherwin P60G2 is one of these).

Brand / Product
DITZLER - DP-40/50 EPOXY PRIMER
DUPONT- VERI-PRIME (PRIMER #615 and CONVERTER #616S)
MARHYDE - Self-etching primer, available in a spray can as well as quarts
PRATT & LAMBERT - Vinyl Zinc Chromate, EX-ER-7 and T-ER-4 Reducer
TEMPO - Chromate in a spray can
SHERWIN WILLIAMS - WASH PRIMER #P60G2 and Catalyst Reducer #R7K44
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Sarasota, FL
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Starting on empennage section - August 2016
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  #39  
Old 03-06-2017, 10:28 AM
Neal Trombley Neal Trombley is offline
 
Join Date: Aug 2016
Location: North Fort Myers
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where are you guys/gals buying your wash primer
Sherwin-Williams P60G2 Semi-Transparent Green Industrial Wash Primer ??

Skygeek has been back ordered, local sherwin guys ( auto) says not available thru him, only tried them due to aluminum bodies today in automotive
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  #40  
Old 03-06-2017, 11:15 AM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default P60G2

Quote:
Originally Posted by Neal Trombley View Post
where are you guys/gals buying your wash primer
Sherwin-Williams P60G2 Semi-Transparent Green Industrial Wash Primer ??

Skygeek has been back ordered, local sherwin guys ( auto) says not available thru him, only tried them due to aluminum bodies today in automotive
Check the SW Web page for distributors. Only the SW auto paint shops carry it. I found one in Denver. There's probably one near you too.
Try these.

FORT MYERS-METRO COMMERCIAL #2366
12990 METRO PKWY STE A
FT MYERS, FL, 33966-1403
(239) 225-0820


FT MYERS-ALICO COMMERCIAL #2445
17131 ALICO CENTER RD STE 1
FT MYERS, FL, 33912-6019
(239) 415-4025
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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.

Last edited by wirejock : 03-06-2017 at 11:18 AM.
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