2k Primer scraping off? Need help - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-16-2004, 11:08 PM
New Member
 
Join Date: Apr 2004
Location: NC
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
2k Primer scraping off? Need help

Hello,

I primed all my fiberglass parts about 5 months ago and realized i needed more bodywork. I finished the filler work about 2 weeks ago and reprimed over the old primer. I scuffed up the 2k with 180 before i shot it to be sure. I'm using U-tech 2k primer and used it before and it seemed fine.

After i wetsanded this 2nd round of 2k i saw there were little pinholes and minor things i had to fix with glaze so as i was sanding down the glaze, the primer had a hint of i guess you could call it an "edge" where the old/new primer transitioned itself around where i was sanding, only revealing the first round of primer as I used my fingernail scraping aggresivly and it started to come off. The area that i could scrape off was a narrow area like the sides of a hood where the jamb is. Seems to me that the large areas are not scraping off and are bonded quite well.

I even tried that trick that Len mentioned about using packaging tape on and pulling it off quickly and no primer came off.

Could this be due to spraying too dry or not enough material on those areas?

Do i need to sand off the new primer and restart on just that particular piece i experienced this with? I have about 10 other med to large parts i sprayed and have not experienced the problem on the others.

I will need to reprime most of the parts as i did minor repairs on them, so would it be ok to just reprime/wetsand, and topcoat?

Any advice will be appreciated. TIA

Chris

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-17-2004, 04:55 AM
Member
 
Last photo:
Join Date: Apr 2004
Location: Georgia
Posts: 3,578
Wiki Edits: 0

Thanks: 10
Thanked 61 Times in 39 Posts
2K primer sticks to fiberglass very good weather sanded or not, so its not a prepping issue unless the edges were contaminated and thats unlikely.
Since primer is good everywhere else we know you did not have a bad isocyanate.
Gasing would be causing problems elsewhere also.

All I can think of would be three possibility's:
Dry over spray of the primer landing on the edges as you were primering.
Or the first coat was dry sprayed around the edges and never had a chance to stick.
Only other thing can think of is excessive heat on edges when sanding.
I assume you are using the High build or 2k-100 and not their
direct to metal (non iso).

Very unusual for sure!

Of course the very best item for raw glass is epoxy first.

Last edited by BarryK; 07-17-2004 at 06:48 AM.
Reply With Quote Quick reply to this message

Recent Body - Exterior posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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



All times are GMT -6. The time now is 06:06 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.