Notices
C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Do you sand between coats of primer?

 
Old 03-12-2019, 02:04 AM
  #1  
brassplyer
CF Senior Member
Thread Starter
 
brassplyer's Avatar
 
Member Since: Nov 2018
Posts: 557
Received 8 Likes on 7 Posts
Default Do you sand between coats of primer?

Using Omni high-build 2K primer - do you favor sanding between coats or do you build it up and then sand?
brassplyer is offline  
Old 03-12-2019, 02:37 AM
  #2  
bfit
CF Senior Member
 
Member Since: Apr 2012
Location: Picton NSW
Posts: 476
Received 67 Likes on 61 Posts
Default

I rub back between every coat.
but I'm from the days of nitrocellulose lacquer,
Bfit

Last edited by bfit; 03-12-2019 at 02:39 AM.
bfit is offline  
Old 03-12-2019, 04:35 AM
  #3  
540 vette
CF Senior Member
 
540 vette's Avatar
 
Member Since: Jan 2002
Location: Commack NY
Posts: 9,793
Received 142 Likes on 117 Posts
Default

Yes I block sand it.
540 vette is offline  
Old 03-12-2019, 12:26 PM
  #4  
71 Vert LS1
CF Senior Member
 
Member Since: Sep 2010
Posts: 489
Likes: 0
Received 65 Likes on 61 Posts
Default

On my C10 project we did two rounds of 2K primer. First round sanded with 180 grit. Second round with 320 grit. Both block sanded with guide coat.
71 Vert LS1 is offline  
Old 03-12-2019, 08:04 PM
  #5  
Sabre34
CF Senior Member
Support Corvetteforum!
 
Sabre34's Avatar
 
Member Since: Jul 2005
Location: Parrish FL
Posts: 19,515
Received 374 Likes on 356 Posts
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-18-'19

Default

Yes.
Sabre34 is offline  
Old 03-13-2019, 05:20 PM
  #6  
71yellow454
CF Member
 
Member Since: Apr 2006
Location: Abingdon Maryland
Posts: 63
Received 21 Likes on 19 Posts
Default

Two coats of epoxy then 3 coats of 2K primer, block with 180 grit and repair anything I missed then two or three more coats of 2K, then block with 320.
71yellow454 is offline  
Old 03-13-2019, 06:53 PM
  #7  
DUB
CF Senior Member
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,674
Received 2,519 Likes on 2,186 Posts
Default

Originally Posted by brassplyer View Post
Using Omni high-build 2K primer - do you favor sanding between coats or do you build it up and then sand?
Actually this is hard to read. I am not assuming anything....

IF you are applying your FIRST coat of primer and THEN apply the next coat WITHIN the flash time specified that will allow the second coat to bond to the FIRST coat....NO....you do not need to sand the FIRST coat.


NOW... If you applied 2-3 coats of this primer and it cured out.....then YES...you MUST sand it so the next round of priming....the primer will have a good surface to bond to due to it is NO LONGER a chemical adhesion bond....it is a MECHANICAL bond.

So...ANYWHERE you do not sand the primer....is an area that the second round of primer will not stick....and if it does...it will not for long.

So...after your second round of priming...ALL of that primer must be sanded so your sealer will stick MECHANICALLY to it. Because ONCE the primer is cured out....chemical adhesion no longer takes place due to the primer did what is was supposed to do....cure out.

DUB
DUB is offline  
 


Thread Tools
Search this Thread
Quick Reply: Do you sand between coats of primer?


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: