Frame sandblasted
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
Frame sandblasted
I picked up my frame and many parts from the sandblaster this weekend. I'm not sure I'm thrilled with the work. There are a couple areas which have small specks of brown remaining. I'm contemplating bringing it back for more work. I want I to get some etching primer on it ASAP. It has been very humid here for the past week with rain nearly every day. Just checking here, if I went ahead with it as is will I regret it?
And while we're at it, what is the recommended prep following sandblasting? Do I just wipe it down with lacquer thinner then apply the etching primer?
And while we're at it, what is the recommended prep following sandblasting? Do I just wipe it down with lacquer thinner then apply the etching primer?
Last edited by gccch; May 26, 2014 at 11:33 AM.
Melting Slicks
Joined: Sep 2013
Posts: 2,882
Likes: 2,178
From: Chicopee MA.
If you are worrying about the small specks in the last two photos, I would not be concerned with them.
However, It looks like he did the front end and the next two crossmembers one day, and the next day or so, he finished it.
It may be your lighting. If you can wipe off the rust with a clean white rag, it could be a problem.
Depending on the grit used, we sometimes sand it with 80 grip paper on a DA.
We don't use acid based primer any more, DuPont and PPG both have excellent two part primers that you cant even scrape off.
Dupont even has an Industrial Imron paint that can be sprayed over bare metal, and it's cheap and very durable.
However, It looks like he did the front end and the next two crossmembers one day, and the next day or so, he finished it.
It may be your lighting. If you can wipe off the rust with a clean white rag, it could be a problem.
Depending on the grit used, we sometimes sand it with 80 grip paper on a DA.
We don't use acid based primer any more, DuPont and PPG both have excellent two part primers that you cant even scrape off.
Dupont even has an Industrial Imron paint that can be sprayed over bare metal, and it's cheap and very durable.
Last edited by Roger Walling; May 26, 2014 at 12:39 PM.
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
Yes, it is the small specs I am concerned about. If it's not really a problem I won't bother hauling it back, but I wanted some expert opinions.
Melting Slicks
Joined: Nov 2004
Posts: 2,311
Likes: 223
From: Temecula CA
No baking as far as I know. never heard of that before. He will do it again and suggested Hold Tight treatment which he can do to keep it clean short term. Not going to powder coat. I did give it some thought but I need to do some patching and it seems the etching primer and epoxy primer over that should be good enough for a fair weather driver.
Yes, it is the small specs I am concerned about. If it's not really a problem I won't bother hauling it back, but I wanted some expert opinions.
Yes, it is the small specs I am concerned about. If it's not really a problem I won't bother hauling it back, but I wanted some expert opinions.
Myself, I'd just hit it with a wire wheel or twisted wire cup on an angle grinder, then use some rust converter to neutralize anything left.
If your blaster is using a coarse grit, I'm not sure it's going to get down into the smaller rust pits.
Melting Slicks
Joined: Mar 2006
Posts: 2,640
Likes: 67
From: Livin' large and havin' fun in wonderful Oklahoma
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Team Owner
Joined: Jan 2008
Posts: 30,894
Likes: 1,189
From: chicago
you need to wipe it with thinner,the sand gets dirt/grease in it and then gets pounded into the frame,just wipe it off 1hr before painting,and make sure you can get inside the frame everywhere you can too
Pro
Joined: Apr 2005
Posts: 510
Likes: 13
From: Fort Collins CO
I do "media blasting" in Colorado & wouldn't allow a job like that to go out my door…..its hard to see while blasting but I always do a final check and usually have to hit a couple spots that were missed.
As far as treating I don't get involved in that process with all the fire code requirements, however I would wipe it down as there is always dust remains on the parts and should be addressed…..
I use a product from Dupont - "Starbrite" works great, but I don't do fiberglass, just metal cars…...
As far as treating I don't get involved in that process with all the fire code requirements, however I would wipe it down as there is always dust remains on the parts and should be addressed…..
I use a product from Dupont - "Starbrite" works great, but I don't do fiberglass, just metal cars…...
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
I am resurrecting this post as I have made the repairs to the frame and was hoping to get the next coating, epoxy primer over the etching primer. I am concerned about the work I have already done. Most of the frame has a thin coat of etching primer. Some areas, where tiny bits of rust were remaining in tiny crevices on the surface seem to have come through the etching primer. (Frame has been inside my garage all summer with whatever humidity goes with that). There were a lot of varying opinions on what to do with this back when it was freshly sandblasted. Now I have to revisit whether to start over or move on with the industrial two part epoxy primer. I hit the areas with a wire wheel and recoated. Here are a couple pics of what I am talking about. I was hoping to get the next coating on before winter hits here. They're talking snow maybe Saturday and today and tomorrow are near 70, good for painting. I am very concerned about my inexperience showing through here.... As rust showing up on a completed project.
Last edited by gccch; Oct 28, 2014 at 03:59 PM.
Drifting
Joined: Jan 2012
Posts: 1,734
Likes: 287
From: Limerick Pa, Saint James City Fl
I blasted my frame myself so I just kept doing it till I was happy or tired of trying, but it was black imron paint i was chasing out of those tiny holes or specs. After that I treated it with stuff from eastwood called "after blast" treats the metal and prevents rust flashover, then 2 part epoxy primer and eastwoods chassis black, very happy with how it came out. I also treated the inside of the frame with some green stuff from eastwood, can't remember the name of it, supposed to stop any active rust and prevent any future rust, seems like a good idea, I would do it all same way if I do another frame off. Chip
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
The guys at the paint supply sold me some DELTRON DPLF epoxy primer. They initially said this should not go over acid etch primer, but I have used SEM self etching which they then said is ok, but won't seal it. They stressed the top coat needs to be applied within 3 days. So I need to plan this better.
First, I have to figure out what to do with this situation. Will the DPLF cover it and keep it from reappearing?
First, I have to figure out what to do with this situation. Will the DPLF cover it and keep it from reappearing?
Better look that frame over a bit more before doing any painting. 
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,692
Likes: 157
From: Miami, FL
