Black phosphate treatment for factory bolts - Pontiac GTO Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 04-26-2016, 06:46 PM Thread Starter
Join Date: Dec 2008
Posts: 124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Black phosphate treatment for factory bolts

I came across a good process on how to restore bolts to the factory black color and thought I'd share. Here's a list of the things you need :
Phosphoric Etch and prep - Home depot carries it for under $ 20.
2 32 oz. Pirex measuring cups - or any other decent glass beaker.
Electric hotplate - no gas.
Distilled water
Long nose pliers - they might get ruined
Paper towels
Tall skinny glass jar
I started with glass blasted bolts. Put the 32 oz. Pirex measuring cup on the hot plate at low to medium heat. Fill about half way or less with the etch and prep. I only do 4 control arm bolts and 4 nuts at the same time. They bubble in the solution and it turns to foam. Anymore than that and it will foam over fast. I always do this on my garage floor away from everything. It takes about 20 minutes. Fill the second cup with distilled water and the tall jar with acetone. Take 1 bolt out at a time using the pliers. Dip it in the water and then into the acetone. You can use compressed air to dry it or just set it on the paper towels. The acetone dries fast. That's it. If you want it darker you can put it back in the etch and prep. Sometimes it takes 2 rounds to come out nice. If you do too many bolts at once it foams too much and the bolts are in foam instead of liquid.
The article I found said you can clear coat them, but that defeats the purpose in my opinion. I saw a 64 GTO that was unrestrored with only a few thousand miles in perfect condition. All the fender bolts, a arms bolts, control arm bolts etc were this black.

topfuel67 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 05-18-2016, 01:41 PM
Join Date: May 2016
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Good info
redmanf1 is offline  
post #3 of 3 (permalink) Old 05-18-2016, 06:01 PM
Join Date: Mar 2012
Location: Texas
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
I've never tried that, but the Parkerizing solution that is the OEM technique is very similar but much safer. You can buy the solution on eBay.

Sent from Free App

1965 Pontiac Tempest Custom - 326 bone stock
RT-1 is online now  
Sponsored Links

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Exterior Body

Quick Reply

Register Now

In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Zinc Phosphate Parkerizing BierManVA 1964-1974 Tempest, LeMans & GTO Projects, Barn Finds & Restoration Discussions 0 06-12-2015 10:39 AM
65 frame treatment ric80low 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 3 11-17-2009 07:25 PM
Leather Treatment KyleGT05usmc Interior Discussions 10 03-15-2009 09:22 AM
Frame Treatment Fred007 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 10 11-09-2008 07:16 PM

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome