Stripped Primer with Brake Fluid and have an unusual side effect

The 3rd Placer
08-28-2013, 07:54 PM

Painted my plastic under tray on my newest project with Tamiya Primer then Testors 1 Coat SG Black Lacquer.

Well screwed up the SG Black and removed it with 91% Alchohol...worked out great. The Testors paint wore of like warm syrup.

The primer did not budge but was scuffed up and scratched so it needed to be stripped. I soaked the parts in Brake Fluid for 2Hrs and the primer nearly melted off, again no problems.

As I was cleaning and drying the parts I noticed several "flecks" of a hard salt like material all over the tray and rear diffuser. What is this? Its dryed hard to the surface and can be scratched off with a finger nail etc.

Is there a way to remove these flecks and not have to sand each on off?


08-28-2013, 09:27 PM
I've never experienced this, I don't think, though I have noticed that brake fluid leaves a foggy residue on my model. I would just sand it off with sandpaper, since whatever paint error probably razed the plastic anyway. I almost hate to suggest it, but maybe leave it in a little longer? I suspect it is some sort of accretion of the paint carrier? Maybe?

In any case, I probably don't know the full story behind your name on AF, but I sure do like it! Have you shared any builds yet?

08-28-2013, 09:37 PM
Post a pic or two. Like willmo suggested i would sand it down and throughly clean with soap and water.

08-28-2013, 11:17 PM
I've had something similar with CSC once. After the paint was stripped I scrubbed the parts with a toothbrush in the sink with soap and water then let them air dry on some paper towel. Hours later I noticed that there was like you described a white salty looking substance on several area of the parts. I just chalked it up to residue left from the primer that the car was painted with. Mine was on a diecast I bought so I don't know the type of paint or primer used. On mine I just scratched the residue off with a hobby knife and then sanded. For yours on plastic, I'd try the soap and water route and just scrub with a toothbrush before sanding.


The 3rd Placer
08-29-2013, 04:44 AM
Thanks for the replies, I'll post some pics soon.

I'm afraid I dont have any car builds, last one was in 1987. Since then I have been a airplane and tank modeler. Lately I wanted to finally learn the car side of the hobby. Here are some links to some builds...warning they are not shiny!

I was also lucky enough to get a book published, co authored with a friend.

Here is a airplane...

My name originated when I first started entering contests I always seemed to get a 2nd or 3rd place. So the name was born...The 3rd Placer. Dont have that problem any more with Armor or AC models...but cars I might as well be the 10th Placer as I'm trying to learn all I can.

My 1st build log on this site was a false start...I tried to begin a S27 F1 GTR, but am in over my I started a Nissan R34 Xanavia build.

Thanks for reading and I will post pics of the primer problem. BTW the fleck appeared in the Brake Solution and could be moved around with a tooth brush but simply landed on another portion of the car..very strange.


The 3rd Placer
08-29-2013, 05:50 AM
Here is the pic... (
image ( by The 3rd Placer (, on Flickr

What looks like white residue is actually hard crusted particles.

As I said before these particles were present in the solution of Brake Fluid...they appeared when I started tooth brushing the primer out of nooks and crannies.


08-29-2013, 10:42 AM
i do get that problem, though with 99% isopropyl alcohol and i'm rinsing the soaked parts under running tap water. the crusted things though seem to be paint particles that clumped together, and i usually wetsand them off with 600 grit.

Add your comment to this topic!