Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

Paint Primer cracking!

 
LinkBack Thread Tools Display Modes
  #1  
Old 03-04-2012, 06:09 PM
Platinum Member
 
Join Date: Nov 2008
Location: Central Pennsylvania
Posts: 4,022
Paint Primer cracking!

This is the first time I've experienced this. I've painted this stock in the past with success. But when I sanded and hit with primer, the primer is cracking when it dries. Do I have contamination on the areas that it is cracking? It is a B&C Medalist A2. After the last sanding before I tried the first coat of primer, I blew it off with the air nozzle. Then I wiped it down with Witch hazel (didn't have denatured alcohol) to get the dust the nozzle didn't get. Did the witch hazel contaminate the stock?

__________________
Matthew 7:13-14
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

Friends don't let friends develop canonitis!-chucknbach

arguing over the internet is like the special Olympics....even if you win, you are still...special!

Last edited by liltank; 03-04-2012 at 06:49 PM.
Reply With Quote
  #2  
Old 03-04-2012, 06:57 PM
Platinum Member
 
Join Date: Dec 2009
Location: Holland, MI
Posts: 1,528
Re: Paint Primer cracking!

I use PPG wax and grease remover (automotive) but you can buy similar products at most auto parts stores.

I suspect your prep agent didn't help at all. Lacquer thinner or enamel reducer would work in a pinch, but the wax and grease remover works every time for me.
Reply With Quote
  #3  
Old 03-04-2012, 06:58 PM
Platinum Member
 
Join Date: Nov 2008
Location: Central Pennsylvania
Posts: 4,022
Re: Paint Primer cracking!

Thank you.
__________________
Matthew 7:13-14
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

Friends don't let friends develop canonitis!-chucknbach

arguing over the internet is like the special Olympics....even if you win, you are still...special!
Reply With Quote
  #4  
Old 03-04-2012, 07:16 PM
Silver Member
 
Join Date: Mar 2007
Location: Dallas,OR
Posts: 339
Re: Paint Primer cracking!

The witch hazel must of had some type of oil in it. The cracking is definately caused by contaminates on the stock. I'm not sure witch hazel can even cut the oil from your fingers. The air you used could have had contaminates in it as well. It's happened to me before and your gonna have to clean everything off and start over.
__________________
AKA "BLACKTAIL SNIPER"
7LRM smithed by Gunwerks
Stiller TAC 300
Broughton fluted 5.75, 5c @ 28"
Graphite Black Cerakote
Jewell Trigger
GreyBull Precision Stock
180VLD's@3145fps. with 72.8grs. of H1000, 215m primer
Reply With Quote
  #5  
Old 03-04-2012, 09:00 PM
Silver Member
 
Join Date: Aug 2006
Posts: 163
Re: Paint Primer cracking!

I spent about 10 years in the chemical coating industry, mostly dealing with automotive and chemical coatings....

The defect in the photo above is not from contamination.......contamination does not cause the type of "cracking" your photos show. What I am seeing in your photos is called "lifting" and is caused by the solvents in the fresh primer penetrating the previous coat of paint and causing it to swell.....or, the undercoat is absorbing the solvents and they are trying to come out after the primer is dry on the top.

Basically, your primer is incompatible with the previous paint........you either need to strip the stock, or sand it smooth and find a water based primer/sealer to seal the undercoat from the new topcoat and prevent the solvent of the new topcoat from penetrating into the substrate.

If it was mine and I wanted it done right, I'd strip the stock and start over.
Reply With Quote
  #6  
Old 03-04-2012, 10:31 PM
Platinum Member
 
Join Date: Dec 2009
Location: Holland, MI
Posts: 1,528
Re: Paint Primer cracking!

Quote:
Originally Posted by buzzgun View Post
I spent about 10 years in the chemical coating industry, mostly dealing with automotive and chemical coatings....

The defect in the photo above is not from contamination.......contamination does not cause the type of "cracking" your photos show. What I am seeing in your photos is called "lifting" and is caused by the solvents in the fresh primer penetrating the previous coat of paint and causing it to swell.....or, the undercoat is absorbing the solvents and they are trying to come out after the primer is dry on the top.

Basically, your primer is incompatible with the previous paint........you either need to strip the stock, or sand it smooth and find a water based primer/sealer to seal the undercoat from the new topcoat and prevent the solvent of the new topcoat from penetrating into the substrate.

If it was mine and I wanted it done right, I'd strip the stock and start over.
Do you think that if he stripped it and sanded it, and had a buddy who does automotive body work spray it with epoxy primer that it would prevent this with the next coat?

I know that DP 90 is popular as a primer and sealant, for example.
Reply With Quote
  #7  
Old 03-04-2012, 11:06 PM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,362
Re: Paint Primer cracking!

Snap hoss, I see sanding in your future!!!!
__________________
High Fence, Low Fence, Stuck in the Fence, if I can Tag it and Eat it, it's Hunting!
"Pain is weakness leaving your body"
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Paint Primer cracking!
Thread Thread Starter Forum Replies Last Post
Small rifle primer vs small pistol primer??? HUAINAMACHERO Reloading 6 05-22-2012 10:27 PM
Which primer for 300 RUM? ProfessorM Reloading 4 02-04-2010 02:48 PM
FS: RCBS Automatic Bench Primer & Auto primer nad1967 Reloading Equipment and Components 1 12-08-2009 08:50 PM
RCBS APS Hand primer & Lee Hand primer accuratebrass Reloading Equipment and Components 2 12-07-2008 02:54 PM
RCBS Bench mounted Primer (Strips) and Primer Strip Loader. Roll-Yur-Own Guns For Sale 3 03-13-2007 04:35 PM

Current Poll
Do you plan to buy a new custom rifle in the next 12 months?
YES - Of course - 72.94%
1,639 Vote
NO - wife/girlfriend won't let me. - 27.06%
608 Votes
Total Votes: 2,247
You may not vote on this poll.

All times are GMT -5. The time now is 11:46 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC