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05-22-2019, 07:26 AM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Man, I can't believe you guys would have the nerve to recommend using a tool priced at less than .1 AMU for a space-qualified a/c like the RV, *especially* on *this* forum.
Charlie
(Kolb Twinstar restored, and painted completely with a H.F. p/n 67181)
(obligatory ;-), added for clarity )
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05-22-2019, 08:21 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Waste
Quote:
Originally Posted by Kyle Boatright
There is little or no difference in the amount of paint wasted or cleaning time between a big gun and a little gun. In both cases, you mix slightly more paint than you think you'll need (nothing worse than running out of primer 97% through the job), spray the items, and clean up.
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Easy fix. Buy a disposable cup system with small cups. Calculate the amount of paint used on a few jobs then use the formula plus 10% moving forward. I waste very little and if there is any left, I collapse the cup and cap it. Often a little part needs primer or some holes need a touch up.
__________________
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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05-22-2019, 09:19 AM
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Join Date: Jul 2018
Location: WNC
Posts: 246
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Quote:
Originally Posted by rzbill
Are we talking about priming the whole exterior at once or priming the individual fabricated pieces? I can't see using the bowl of a full size gun for small parts without wasting a lot of mixed primer.
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You can dial back a full-sized sprayer to have about a 2-3" spray pattern and not waste too much. Top-cup sprayers will use about 99% of the material put in them. The rest is stuck to the cup. You won't get the transfer efficiency that an airbrush gives but it's also a magnitude or two faster.
I've been prepping entire sub-assemblies and spraying them. Use a 4-6" spray pattern on skins and 2-3" on ribs and spars, etc. Total transfer efficiency is probably around 60% due to the ribs. It takes 10-15 minutes to spray everything and most of that is spent moving parts around.
As for guns, I've used both styles of HF guns, Sharpe, DeVilbiss, Binks, Eastwood, Craftsman, and a few others. They all spray primer just fine. The $30 HF is a definite upgrade from the $10 one.
I would consider the $10 HF gun disposable. Every one of them has developed an issue over time where they'd have an inconsistent transfer or leaked or whatever. They get binned once that starts. i've never been able to figure out a fix. The better guns never have the same issue and I clean them all the same.
There are a couple of things you can do to set yourself up for success: 1) throw away the little in-cup filter and use proper (~190 micron) strainers. 50 of them will run you about $8-10. Pour the mixed primer through it and into the gun 2) get an on-gun regulator and use it to adjust pressure with the gun running. 3) learn to setup the gun to get a proper fan and flow. You want to be able to pull the trigger all the way to the stop and spray (don't try to feather the paint by hand). Then you just need to get the 40-50% overlap to get success. 4) be sure to keep the vent in the cup clear and clean. if that clogs your paint won't flow. 5) painting is 95% prep, 4% cleanup, and 1% actually spraying stuff.
Also, be sure your compressor is big enough. HVLP guns like air and a lot of it. Most 110v compressors are going to struggle to supply enough air to spray continuously.
DeKups or 3M PPS cups are amazing as well. I bought the PPS 2.0 system this year and can't believe I didn't buy it earlier. It's nearly a wash vs buying regular mixing cups and strainers. Probably < $1 difference per spraying session.
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05-22-2019, 04:45 PM
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Join Date: Nov 2018
Location: Eagan, MN
Posts: 47
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For clarification I am talking about priming the parts during construction. Right now I'm thinking professional job for the exterior when its assembled. I figure it should atlas look nice even if it flys crooked.
So far I have had good success with the rattle can, and I think I may have found a place online that's not too bad if I buy the cans by the case, the other issue I have to look into is my compressor size. It works fine so far with my rivet gun and air drill, all though it has just enough capacity for the air drill. It would be a good excuse to 'upgrade' my compressor, but just received a 'ball park' estimate for one of the 'keep the wife happy' home projects, and....well maybe not just yet on the compressor
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05-22-2019, 05:15 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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HVLP
Quote:
Originally Posted by Dave S
For clarification I am talking about priming the parts during construction. Right now I'm thinking professional job for the exterior when its assembled. I figure it should atlas look nice even if it flys crooked.
So far I have had good success with the rattle can, and I think I may have found a place online that's not too bad if I buy the cans by the case, the other issue I have to look into is my compressor size. It works fine so far with my rivet gun and air drill, all though it has just enough capacity for the air drill. It would be a good excuse to 'upgrade' my compressor, but just received a 'ball park' estimate for one of the 'keep the wife happy' home projects, and....well maybe not just yet on the compressor
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I primed everything inside with a DeVilbiss FLG and a 30 year old Craftsman 5HP, 20G, 220v compressor. Yea. I had to stop and flip parts and let the old girl catch up but it can be done.
She's pretty tired but still has some life left. I drain the tank and check oil often. Keep your eye on Craigslist. I've seen some killer deals.
__________________
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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05-22-2019, 07:11 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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If you're planning on staying in the region, then you don't need to prime. Closer to the coast, certainly. Just something to consider.
I've got a 1955 Cessna that was never primed. It spent most of its life in the middle of the country, and has very little corrosion. What corrosion it does have was from six months tied down outside of Philadelphia. It spend several years in Oxnard, CA, a scant few miles from the beach, and was in a hangar. That did not add to the corrosion. It was a good hangar.
Dave
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05-22-2019, 07:36 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Quote:
Originally Posted by Kyle Boatright
There is little or no difference in the amount of paint wasted or cleaning time between a big gun and a little gun. In both cases, you mix slightly more paint than you think you'll need (nothing worse than running out of primer 97% through the job), spray the items, and clean up.
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I have a hard time with the idea of mixing 1oz of 2 part primer in a quart paint gun and then hoping that any will come out the nozzle because it won't reach the siphon. With the airbrush, that fills the jar and will do the half dozen parts fabricated that evening.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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05-22-2019, 07:43 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,219
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Quote:
Originally Posted by rzbill
I have a hard time with the idea of mixing 1oz of 2 part primer in a quart paint gun and then hoping that any will come out the nozzle because it won't reach the siphon. With the airbrush, that fills the jar and will do the half dozen parts fabricated that evening.
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The HF gun we're talking about gravity feeds from a top mounted cup - it doesn't have a siphon. Every drop of paint other than the film left in the cup can be used...
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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05-23-2019, 06:27 AM
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Join Date: Jan 2005
Location: Brighton, Colorado
Posts: 393
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Quote:
Originally Posted by rzbill
I have a hard time with the idea of mixing 1oz of 2 part primer in a quart paint gun and then hoping that any will come out the nozzle because it won't reach the siphon. With the airbrush, that fills the jar and will do the half dozen parts fabricated that evening.
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Hi Bill,
I know almost nothing about airbrushes. My initial reaction is concern that an airbrush would have a tough time spraying primer because it?s too thick for the orfice. Is this a problem?
My logic may be flawed because most of the primer I?ve sprayed is the thick and juicy high build primer intended for fiberglass pieces. Is this just not an issue for metal primers like Azko?
What?s the widest fan setting on the airbrush setup you?re using?
Can you post the make and model for your setup? This isn?t something I?ve considered, but it sounds like it has potential!
Thanks in advance!
__________________
Rod Woodard
Brighton, Colorado (CO12)
RV-3 N87CT (Thanks Chuck!)
Glasair 1RG N388DM
RV-3 N99RV sold 01/2000
F1 MkIII empennage?arrived 08/22/2018--collecting dust
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05-23-2019, 07:00 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Quote:
Originally Posted by Kyle Boatright
The HF gun we're talking about gravity feeds from a top mounted cup - it doesn't have a siphon. Every drop of paint other than the film left in the cup can be used...
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Thanks Kyle, I have not used that model. Sounds like it would work fine. I had missed looking at your link posted earlier.
Rwoodard,
I used Dupont Variprime self etching primer which is thin and can be reduced if needed. It dries really fast which was nice.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
Last edited by rzbill : 05-24-2019 at 03:06 AM.
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