-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics
topic 3507

Vinyl Wash Primer on G-90 Hot Dip Galvanized Sheet Steel


We are using a 2 Part Wash Primer Per DOD-P-15328 [link by ed. to spec at TechStreet], following hot alkaline cleaning, rinsing, blow drying, as a pretreatment for "dry" non-oiled, non-chromated G-90 Hot Dip Galvanized Sheet Steel, for the application of a military epoxy primer, and ultimate CARC topcoat. This systems is a recommended pretreatment in Mil-Std-193 (which I know has been cancelled). My question - is this an acceptable pretreatment for G-90 zinc coated steel for the subsequent coatings application. In addition what is Mil-P-12879, this was also referenced in Mil-Std-193 as the desired pretreatment? Any and all assistance is greatly appreciated. Thank You. Sincerely, Bob Hathaway

robert hathaway
trucks - Oshkosh, Wisconsin


Bob, Though I have never painted hot dip galvanized, I do paint a lot of zinc plated fasteners. If the part does not have a supplemental conversion coating over the zinc, then the wash primer is the way to go. (We also use DOD-P-15328) Your galvanize probably does not have a conversion coating over it.

I do not know of a Mil-P-12879, but do know a Mil-T-12879 as called in 193. I do not have a copy of it as it has been cancelled. However, 12879 cancellation notice refers to ASTM D2092 [link by ed. to spec at TechStreet] Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting. Depending on your contract, you may still be help to 12879, but the technical information in the ASTM is still a good reference.   ASTM 2092 Contains methods A-F for pretreating this material. Method D-Acid-base Resinous Treatment is DOD-P-15328 [link by ed. to spec at TechStreet]. So again, this points that wash primer is the way to go.

Kelly Draper
- West Plains, Missouri

July 9, 2008


Plating shop employee - CAI JIA PO

July 10, 2008


It means a coating weight of 0.90 ounces per square foot.


Ted Mooney,
Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.