Yesterday's Tractor Co. Same-Day Parts Shipping Available
Click Here or call 800-853-2651 
   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
Antique Tractor Paint and Bodywork

Re: Omni acid etch proper use/prep before hand

[Show Entire Topic]  

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

12-14-2012 07:44:49

Report to Moderator

Brandon, You question is one that is fairly hotly contested on this forum. I have had tractor body panels that I have had pros paint for me that after 3-6 years I can see little rust bubbles forming in places where there would have been pits prior to the refinishing. Just prior to the appearance of these bubbles on these panels, I was sandblasting and painting a dump truck body. When picking up the paint the counter man told me that I also needed acid wash. I had not heard of it so he explained how after you take the metal down to bare metal, there will always be some rust left at the bottom of the pits, so you need to "wash" with the acid prior to priming, if you don't want your new paint to bubble. He also advised wiping the surface down after the acid wash with a liberal application of a final prep product to remove moisture to prevent flash rust. There are a lot of phosphoric acid products on the market for converting rust to black iron oxide which is inert and is actually a barrier protective coating on steel and cast iron. The liberal final prep application also removes excess phosphoric acid residue. If the wipe down is inadequate, upon drying a little white residue will be left This residue can be removed with a little brushing, as with a plastic bristle scrub brush. The acid wash is even more important on cast iron than steel due to the pores in cast iron which will easily harbor rust molecules. CNKS will soon post his rebuttal, that epoxy primer will penetrate to the bottom of pits and pores, just as well as the acid will chemically "eat" it's way to the bottom.

[Log in to Reply]   [No Email]

12-14-2012 11:41:54

Report to Moderator
 Re: Omni acid etch proper use/prep before hand in reply to showcrop, 12-14-2012 07:44:49  
Showcrop, I use Picklex 20 or Must For Rust on pits on sheet metal. There is no good, safe way to get it out of the pores on cast. I did not say that epoxy will penetrate to the bottom of pores, it won't. I imagine that if there is rust activity in those pores that epoxy will at least slow the rust down. It is a good sealant, whether or not it will prevent rust from coming to the surface I don't know, as I have never seen rust lift anything on cast on my tractors. Rust is not my problem, it may be yours and others that live in humid climates, especially in salt air as you do. If anyone actually knows how to safely seal or remove rust from pores in cast I would like to know it. And, one person posted on this forum a few years back that claimed that etch lifted the paint on his tractor about a year later, true or not I don't know. I just don't think it's a good idea.

[Log in to Reply]  [No Email]
[Show Entire Topic]     [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 © 1997-2015 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