Mirror White Question

[Guest]

Ok, so we are new to PC'ing (hobby set up), and we are having an issue with Mirror White on a valve cover. We prep'd the cover by blasting, out-gassing, and then using acetone to clean before coating. The powder / finish looks great, except there are a few spots where red has seeped through the white. The valve cover was originally painted red, but after blasting there were absolutely no signs of red on the surface before we coated it (we checked and double checked as this was the second one and we had the same problem with the first one).

So, I have a couple questions......
(1)Is there something else we should be doing for prep?
(2)Would a primer stop this from happening?
(3)Is this just an issue with light colors, or would it happen with darker (gold) colors too?
(4)Best product to use to strip the finish off the first one?

Any advice is appreciated!
Thanks!

[Guest]

Re: Mirror White Question

Where did the powder come from? Are you sure it had no contamination?

[Guest]

Re: Mirror White Question

Where did the powder come from? Are you sure it had no contamination?

PBTP. No contamination on our end (havent done anything red) - he cleans everything thoroughly after each use.

It is weird because the red isnt all over, just in a few places.

[Guest]

Re: Mirror White Question

Then you have got me baffled as well, just thought I would bring up the most obvious. I get excited sometimes and cross junk cause I forget where Im at I guess. Sorry I cant help.

[Guest]

Re: Mirror White Question

I`ve been using the KL Primer under just about everything and it works great, especially under light colors. You may wanna give it a try.

[Guest]

Re: Mirror White Question

I`ve been using the KL Primer under just about everything and it works great, especially under light colors. You may wanna give it a try.

We have this on our list of things to buy next.

[Guest]

Re: Mirror White Question

Welcome to the forum PowderGirl
(1)How large are the red areas? Are they tiny specs or larger? Typically after out gassing the part should be either cleaned/degreased or blasted again. The debate goes on as to which is best. I've had success using both methods.
(2)As mentioned a primer will help
(3)Depending on the cause you may see this with other colors. (gun not clean enough).
(4)Cybersolve from PBTP, aircraft stripper,D-solve 1012, you could also try Permatex Gasket Remover.

Thanks for the info. We are definitely getting some primer for future use. As for the gun, he does a thorough job cleaning it, and since we havent shot red, I dont think that was the problem. The red areas vary in size and they are kind of splotchy. I will see if I can get some pictures later. After outgassing he wiped it down with acetone, but didnt blast....guess we could try that.

[Guest]

Re: Mirror White Question

I don't like to wipe down blasted parts, the rough surface grabs too much rag lint. A quick once over with a hand held propane torch will help in removing any lint or dust bunnies. What color was the rag he used?
After blasting I use clean/dry compressed air and a back brush like you would use in the shower. After that you can you use acetone or whatever in a spray bottle and spray till it runs off clean. Be sure it's completely dry before you pc.

The towel thing was blue. He then used the air compressor to blow off any lint and wetness.

[Guest]

Re: Mirror White Question

I'd think the most obvious answer is all the original red paint was not removed. Even outgassing doesn't physically remove anything - regardless of the order you do it in.

I've had a few older pieces of Patty O's that were painted with some nasty red from hell, and even the smallest little speck remaining bled thru Chrome Smoke. Sometimes a second coat will cover up the problem - sometimes not, it just depends on how much red residue is really there and what it actually is. And THAT is the hard part, determining what it is you're trying to remove: making "clean", "cleaner", and "cleaner'er", the three most important steps you can take.

The lighter the color you're shooting, the worse the problem can be amplified. At this point, since you're not sure what's causing the problem, I'd suggest 2 things, strip and start over & loose the rags. Get some spray bottles for whatever final cleaner you prefer and spray till dripping clear.

As for the outgassing/blasting vs. blasting/outgassing, go to a salvage yard and get two matching valve covers (I'm assuming the one giving you fits is cast aluminum), do one by each method and decide what works best for you.

[Guest]

Re: Mirror White Question

I'd think the most obvious answer is all the original red paint was not removed. Even outgassing doesn't physically remove anything - regardless of the order you do it in.

I've had a few older pieces of Patty O's that were painted with some nasty red from hell, and even the smallest little speck remaining bled thru Chrome Smoke. Sometimes a second coat will cover up the problem - sometimes not, it just depends on how much red residue is really there and what it actually is. And THAT is the hard part, determining what it is you're trying to remove: making "clean", "cleaner", and "cleaner'er", the three most important steps you can take.

The lighter the color you're shooting, the worse the problem can be amplified. At this point, since you're not sure what's causing the problem, I'd suggest 2 things, strip and start over & loose the rags. Get some spray bottles for whatever final cleaner you prefer and spray till dripping clear.

As for the outgassing/blasting vs. blasting/outgassing, go to a salvage yard and get two matching valve covers (I'm assuming the one giving you fits is cast aluminum), do one by each method and decide what works best for you.

We were leaning towards small specks that just werent visible, but I thought I would check to see if anyone had other suggestions (we are brand new to this). We did the first one, had the issue with red specks, so took extra steps to make the second one as clean as possible, but I guess there were still some specks that we just didnt see. Thanks for the help.

[Guest]

Re: Mirror White Question

I have to agree with CPC-2...

[Guest]

Re: Mirror White Question

I have to agree with CPC-2...

So do I. I was going to say that but guess I didn't have the heart. PowderGirl seemed pretty adamant in her first post that there was no red paint remaining.

To the naked eye, you couldnt see any......but that answer makes the most sense.