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  #1  
Old 02-25-2017, 03:35 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,208
Default Gun for High Build Primer

I'm shooting a urethane high build primer through a Harbor freight HVLP gun and am having problems. My guess is the orifice (1.3mm, IIRC) is too small to reliably spray the primer.

Does anyone have a recommendation for a cheap primer gun with a larger tip?
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2019(?) RV-10
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  #2  
Old 02-25-2017, 04:53 PM
60av8tor 60av8tor is offline
 
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Location: Harrisburg, Pa
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Kyle - my HF gun (purple - 2 gun set, $50 I believe) came with a 1.4 and 1.8. Bought it about 3 years ago, so I'm not sure if they have something similar for sale currently.

I'm soon ready for high build as well and have been researching - may I ask what you're shooting?

Edit - just looked at the website: http://t.harborfreight.com/professio...kit-94572.html
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RV-7A purchased flying - Sold 6/16
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Last edited by 60av8tor : 02-25-2017 at 05:29 PM.
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  #3  
Old 02-25-2017, 04:53 PM
humptybump humptybump is offline
 
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I use a 1.7 for very thick material including filler primer.
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  #4  
Old 02-25-2017, 04:56 PM
Wayne Gillispie Wayne Gillispie is offline
 
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1.7 is bare minimum. See if your supplier has a reducer that may help. Ensure you are using 3/8" hoses, not 1/4".
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  #5  
Old 02-25-2017, 05:23 PM
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az_gila az_gila is offline
 
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Location: 57AZ - NW Tucson area
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Smile

I bought one of these sets for that exact purpose after junking my HF gun -

http://www.eastwood.com/devilbiss-au...up-system.html

Low end of a good name and it comes with a 1.8 tip.
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  #6  
Old 02-25-2017, 06:37 PM
noelf noelf is offline
 
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I do not know what primer you are using, but...

Most paint and primer suppliers publish a data sheet which contains the recommended air pressure and gun orifice size for optimum results, as well as mix ratios vs application environment temperature. Check the data sheet against what you are currently using and see if a change is needed.
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  #7  
Old 02-25-2017, 07:13 PM
Kyle Boatright Kyle Boatright is offline
 
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Quote:
Originally Posted by 60av8tor View Post
I'm soon ready for high build as well and have been researching - may I ask what you're shooting?
Jon,

I'm using a combination of products on the interior and fiberglass of the airplane.

I'm using Southern Polyurethanes' Epoxy Primer over the SW wash primer, unprimed aluminum, and fiberglass. About $200/ two sprayable gallons. It gets good reviews and has performed well for me, both in being user friendly and appearing to bond well to the substrate and subsequent products. Here's a link (the product is at the bottom of this page):

http://www.southernpolyurethanes.com/products

I've used two different topcoats on the interior. One was Summitt Racing's Hot Rod Flat Desert Tan. I liked the way it sprayed and finished, but the color was a little too yellow for what I wanted. I'm probably going to use their hotrod grey on the inside of the cabin top and maybe the rest of the interior. Not sure yet. Here's the desert tan:

https://www.summitracing.com/parts/sum-up351/overview/

The other product I've tried on the interior is Kirker urethane in grey. It sprayed very well and I wouldn't hesitate to use it on the interior of the airplane. If I was on a really tight budget, I might use it or one of Summitt's gloss products on the exterior as well. The Kirker single stage urethanes (and color chart) are here:

http://www.autobodytoolmart.com/ultr...ts-c-1453.aspx

On fiberglass, I'm using this high build primer on top of the micro, epoxy wipe, and epoxy primer. Again, from Summitt Racing. When I can keep the gun from clogging, it goes on well too.

https://www.summitracing.com/parts/sum-up220/overview/

Depending on who you talk with, the paint and primer from Summitt *may* be re-labeled Kirker products. In any case, all of the Kirker and Summitt products seem to play well together, and I haven't had any problems other than spraying the really thick high-build primer.

BTW, the Kirker and Summit products are relatively inexpensive (vs the big brands), as are their reducers, activators, etc. Their story is their products are very comparable to the name brands from a performance standpoint, but the end user doesn't have to cover the expenses from advertising, broad distribution channels, or a wide network of brick and mortar paint jobbers.

For exterior paint, I have a deal worked out with a friend with an aircraft paint shop located at my home field. I'm supplying an airframe (in pieces) ready to paint with all of the sanding, filler, etc. complete. He's to take it from there.
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  #8  
Old 02-25-2017, 09:03 PM
rockwoodrv9 rockwoodrv9 is offline
 
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I agree with Wayne - use 3/8" hose and fittings. You need the HV part of the HVLP. Remember the volume at the gun is only as much as the smallest fitting. You will notice a huge difference in how well you paint with more volume.
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  #9  
Old 02-26-2017, 04:45 AM
60av8tor 60av8tor is offline
 
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Quote:
Originally Posted by Kyle Boatright View Post
Jon,

I'm using a combination of products on the interior and fiberglass of the airplane.
Thanks a lot for all the info, Kyle
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RV-7A purchased flying - Sold 6/16
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Build: http://hhav8or.blogspot.com/
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