Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Discussion Forum

Problems spraying high build primer

Welcome Guest, Log in or Register
Author  [Modern View]

02-13-2012 06:08:01

Report to Moderator

I am spraying high build primer over epoxy. The primer is not coming out of the gun consistently. The sprayer is a cheap old suction feed unit. Sometimes the paint comes out when I squeeze the trigger sometimes not. I tried adjusting the amount that it opens with trigger pull, didn't seem to help. The primer is also drying sometimes before hitting surface. I adjusted pressure down to just above where it would pull the best. I disassembled and found no blockage. A friend who paints a lot more than I do has suggested a top feed unit. I have to pick up more paint so I plan to get one to try.

[Log in to Reply]   [No Email]
Stephen Newell

02-13-2012 20:25:03

Report to Moderator
 Re: Problems spraying high build primer in reply to showcrop, 02-13-2012 06:08:01  
It sounds to me like the primer wasn't stired enough. Sometimes primers with a lot of solids takes a lot of agatation. If you pour it through a fine strainer you should be able to tell if there are any undisolved lumps. Sometimes a sprayer may appear ok and you take it completely apart and throughly clean it and it works fine afterwards. I also had one that developed a leak in the siphon tube where it screws on the sprayer. It's like drinking a soft drink through a straw with a pin hole. Not all of it gets there. I ended up having to coat the tube and threads with red coat fuel tank liner to seal it. Of course it can't be taken apart again but it was a cheap gun.

[Log in to Reply]  [No Email]

02-13-2012 14:31:00

Report to Moderator
 Re: Problems spraying high build primer in reply to krazymatt, 02-13-2012 06:08:01  
Quoting Removed, click Modern View to see

Thanks for the information neighbor!

[Log in to Reply]  [No Email]

02-13-2012 09:37:11

Report to Moderator
 Re: Problems spraying high build primer in reply to GordoSD, 02-13-2012 06:08:01  
I am using Nason 421-17 urethane primer with 483-87 activator. I don't know the size of the tip, it is the one that came with it. I checked the vent, it was OK. I found one of the four very small holes in the nozzle was plugged. The label instructions don't call for any thinning.

[Log in to Reply]  [No Email]
Rod (NH)

02-13-2012 10:52:52

Report to Moderator
 Re: Problems spraying high build primer in reply to showcrop, 02-13-2012 09:37:11  
Here's the full tech sheet on the 421-17. You probably have the general purpose 1.8mm tip that was pretty much strandard on the older gravity feed guns so that should be OK. Make sure your gun pressure (35-45 psig) is set AT THE GUN. I see the pot life is only an hour, similar to the PPG surfacer that I use. Don't let it sit around mixed before using. Spray it as soon as you mix it. As the pot life approaches and is exceeded, the stuff thickens up rather fast. That in itself could lead to spray problems with any gun.

[Log in to Reply]  [No Email]
Rod (NH)

02-13-2012 09:08:13

Report to Moderator
 Re: Problems spraying high build primer in reply to showcrop, 02-13-2012 06:08:01  
What specific high build primer are you using? It sounds like you may be using a lacquer-based primer/surfacer. Are you thinning it as per the manufacturer's instructions? Most lacquer-based surfacers that I have used in the past are thinned 1:1 (100%), usually with lacquer thinner. What tip size are you using? The older non-hvlp suction feed guns mostly use a 1.8mm (0.070") tip for general purpose use. That would be the minimum that you'd want to use for a surfacer product. A 2.0 or 2.2 might be more appropriate for the product you are using. Do you have a tech sheet for it? For non-hvlp, try 40-50 psig pressure measured AT THE GUN with the trigger pulled. The fact that you are using a suction feed gun is not your problem. They worked fine in the past before gravity feed became the "norm". Just make sure you are following written manufacturer's instructions, both for the gun and for the exact paint product you are using.

Also make sure the vent hole in your suction feed cup cover is not partially plugged. Using suction feed guns out-of-position with a very fast dry primer or surfacer, can sometimes tend to plug that hole. It also goes without saying that the gun should be disassembled and carefully cleaned after each use. So make sure it is sqeaky clean. Check for any strainer that might be partially clogged on the bottom of the gun pickup tube. If you strain your paint before putting it in the cup, as you should be doing anyway, you don't need that strainer at all.

[Log in to Reply]  [No Email]

02-13-2012 06:47:00

Report to Moderator
 Re: Problems spraying high build primer in reply to showcrop, 02-13-2012 06:08:01  
I have sprayed with a HVLP gun for PPG Omni 182. I use a 1.8 tip. It sprays fine, leaves a rough surface, but it has to be sanded anyway. I know nothing about suction feed guns, but if the gun is clean you need to thin it. MP 182 works fine without thinning, but gets slightly thinned with a ratio of 5:1 primer to hardener. With HVLP use the maximum pressure at the gun, which gives 10 psi at the tip. I have never messed with the pressure and the wide open pattern for topcoat or primer.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters