Go Back  RCU Forums > RC Airplanes > Tips & Techniques
Reload this Page >

Using a Spray Gun

Notices
Tips & Techniques Want to share a tip or special technique you have either in the workshop or at the flying field or race track? Post it right here!

Using a Spray Gun

Old 08-30-2018, 12:49 PM
  #1  
R-Duhb
Thread Starter
 
Join Date: Aug 2010
Location: Bolingbrook, IL
Posts: 161
Likes: 0
Received 0 Likes on 0 Posts
Default Using a Spray Gun

Does anyone know what size nozzle is recommended for applying Sig Supercoat? Iím about to invest in a set of spray guns and want to make sure I purchase the correct size. Iíve already reached out to SIG but have not heard back yet. Thanks!
Old 08-30-2018, 07:45 PM
  #2  
GREG DOE
 
Join Date: Jul 2005
Location: , TN
Posts: 702
Likes: 0
Received 0 Likes on 0 Posts
Default

Check out Harbor Freight for a "touch up gun", something that will produce approximately a 5" fan of spray. I have a DeVilbis 503 gun that my dad bought almost 70 years ago for $17.50. The last time I checked it's was around $160.00 or so. It may have been discontinued? The older style guns were "suction cup guns". Today the "siphon type gun" with the paint reservoir on top are popular. Do as much research as you can, because there are many choices, and you will here many different suggestions.
Old 08-30-2018, 08:08 PM
  #3  
R-Duhb
Thread Starter
 
Join Date: Aug 2010
Location: Bolingbrook, IL
Posts: 161
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks, Greg. I just learned while browsing Harbor Freight that my compressor is too small for any type of sprayer. Mine is rated at 2.6 CFM. The minimum requirement I see so far is around 5 CFM. oooh boyyy.... I had no plans on buying a new compressor.
Old 08-30-2018, 08:29 PM
  #4  
GREG DOE
 
Join Date: Jul 2005
Location: , TN
Posts: 702
Likes: 0
Received 0 Likes on 0 Posts
Default

Look for a used compressor on sights like govdeals.com Also don't be shy. It's possible that you know someone who would let you use their compressor.? Good luck.
Old 09-04-2018, 05:13 AM
  #5  
r ward
 
Join Date: Mar 2018
Posts: 481
Likes: 0
Received 0 Likes on 0 Posts
Default

I've sprayed gallons of lacquer finishing woodwork with the cheap (10 bucks on sale) Harbor Freight purple handled "touch up" sprayer and their small upright tank compressor rated at 2.6 CFM,.....it works fine..... just play with the thinning until it sprays decently. most brush grade lacquers cut about 1/3 sprayed just great. glass smooth finishes on raw wood with only two coats.
Old 09-04-2018, 08:55 PM
  #6  
countilaw
 
countilaw's Avatar
 
Join Date: Jan 2012
Location: Grand Prairie, TX
Posts: 1,305
Likes: 0
Received 0 Likes on 0 Posts
Default



Framed plane ready for two coats of Clear Dope.


Wings doped and red trim applied. Sig Tennessee Red Dope. Wings ready for 2 coats of clear dope.


Fuselage painted with Sig Tennessee Red dope, and ready for two coats of clear which will be sprayed. The silk is a Dharma Trading dye yellow silk.


You need a 1.0 nozzle that you get with the Harbour Freight purple touch up gun. I have two of these guns, one for clear and one for colors. Thin the Sig Super Coat 1:1 and you will have the right mixture for spraying. These little guns known as HVLP (High Volume Low Pressure) guns don't take much air. Your maximum air pressure should be no more than 30 psi. If you can't get a good spray pattern with that, you need to thin your paint more. These are not called siphon guns. Go to your local Automotive Paint store and get a gallon of Medium speed Reducer. It is the same stuff as Dope Thinner. Clean your gun with lacquer thinner.

Here is a picture of a Butter Fly that I am just finishing using Sig Dope and Dharma Silk. I just sprayed the two coats of clear dope on this evening and haven't taken any pictures yet. The red trim was sprayed with an Air Brush.
Old 09-05-2018, 04:57 AM
  #7  
r ward
 
Join Date: Mar 2018
Posts: 481
Likes: 0
Received 0 Likes on 0 Posts
Default

countilaw, your spraying advice above, is right on the money....... and exactly what I found works best for the lacquer I sprayed with that gun. finishing furniture I wanted a decent build on the finish so I sprayed just a little heavier and thinned somewhwere a little less than 1:1 not being concerened about weight one bit. the gun still sprayed real nice.
Old 09-05-2018, 06:33 PM
  #8  
kenh3497
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,507
Likes: 0
Received 0 Likes on 0 Posts
Default

On a small thing like a model plane the panels are relatively small. Spray one panel/surface at a time. Keep an eye on the pressure in the compressor. When the tank pressure reaches the regulator pressure stop spraying and let the compressor catch up. You can practice this with an empty gum and pretend you are painting. You'll be surprised how much you can do with these smaller guns.

Ken
Old 09-06-2018, 03:48 AM
  #9  
TomCrump
 
TomCrump's Avatar
 
Join Date: Apr 2003
Location: Traverse City, MI
Posts: 7,614
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by kenh3497 View Post
On a small thing like a model plane the panels are relatively small. Spray one panel/surface at a time. Keep an eye on the pressure in the compressor. When the tank pressure reaches the regulator pressure stop spraying and let the compressor catch up. You can practice this with an empty gum and pretend you are painting. You'll be surprised how much you can do with these smaller guns.

Ken
Years ago, I painted a '46 Chevy pickup using this same method. It took some time, but the truck looked good.
Old 09-08-2018, 06:36 PM
  #10  
r ward
 
Join Date: Mar 2018
Posts: 481
Likes: 0
Received 0 Likes on 0 Posts
Default

the ideal set up is to use an external regulator. attach it in line with your gun at the compressor and set it to the pressure you want to spray with. then you compressor can run independently of the air pressure you want and will never fluxuate your spraying pressure. I have a moisture separator and air pressure regulator that I got from Harbor Freight that plugs right into my compressor's output connection, then the airline plugs into that. I set that at 30 PSI. and it keeps that pressure constant, no mater what the compressor is doing, because 30PSI is only about half of the compressor's low cut-in pressure.
Old 06-29-2020, 03:11 PM
  #11  
bessiebeardsley
Junior Member
 
Join Date: Apr 2020
Posts: 18
Likes: 0
Received 1 Like on 1 Post
Default

I am wondering the same thing. Can you recommend me something ?

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.