Help! I Shot SPI Universal Clear Over a Stain!

R

RalphL

Hi All,

Here's the background info:

I shot three coats of Cranberry/Cardinal Red PPG JAU single stage, and allowed it to set overnight. The next day, I tacked off the car, and then applied a wet coat of SPI Universal Clear and allowed 30 minutes to flash. When I returned to do the second coat, I noticed near the edge on the driver's side roof, a weird purple 'stain' (approx 1/2" x 1/4") that I had not seen before. Perhaps I didn't stir the SS paint well enough, and the pigments lined-up weird?... not sure.

I went ahead and shot a total of three wet coats - allowing 30 minutes to flash between coats. All of the coats laid out nice and smooth, but of course I have that weird stain underneath. In hindsight, I realize I should have stopped and corrected the stain - but I had the activated SPI clear coat already mixed and ready to shoot, and didn't want to waste it.

Would it be possible for me to gently sand down the affected area, spot-shoot the SS and then reclear?

Any suggestions on how to fix this would be appreciated.

Thank you.
Ralph
 
Is this a spot that only you are going to know is there?
It has been my observation that once I know there is a flaw, no matter how small it is or inconspicuous it may be, that I can't keep my eyes or thoughts off it. LOL
 
Let clear dry enough to mask car overnight to be safe, hit the door with 600-1000 your choice, spot base over the stain and re-clear door with 2-3 coats.

In the future if you see this with first coat of clear, let clear set 15 minutes and just spot in the base, let set 15 minutes and continue clearing.
 
If its been in last two hours and you plan on buffing, you could just spot in base now and spot in clear, it will bite good.
 
I guess JAU is Shop-Line single stage, don't know if that changes the advice any.

If the discoloration is on an edge, it may be pigment separation due to it starting to sag or run.
 
It sure does, i thought this was base clear, forget everything I said except the tomorrow wet sand the door.
 
Barry et. al.,

Thanks for the replies. Yes, this is single stage...

So just to be sure I understand, here's what I need to do:

- wet-sand the area with 600-1000
- spot paint over the area of the stain with the single stage, and
- re-clear the areas with 2-3 coats.

Is this the correct?

I was also planning to shoot another 3 coats of SPI Universal Clear over the entire car because I want to wet-sand and buff out afterward.

Thanks again.
Ralph
 
Is it metallic? Might be tough to achieve a blend if so. It may not hurt to get coverage of your spot, then put one medium coat over the whole panel. If it's a solid color there is little need to do that though.
 
Yes, sand whole door spot area with SS, wait 4 hours and clear whole door.
 
crashtech;22936 said:
Is it metallic? Might be tough to achieve a blend if so. It may not hurt to get coverage of your spot, then put one medium coat over the whole panel. If it's a solid color there is little need to do that though.
Click to expand...

The paint is not metallic, Cranberry red is a solid color red. The area of the small stain is on the outer LH end of the roof.
 
Barry;22937 said:
Yes, sand whole door spot area with SS, wait 4 hours and clear whole door.
Click to expand...

Barry, it's not the door, it's the roof. Can I simply blend the clear - instead of shooting the entire roof? Sorry for all the additional questions.

Thanks.
 
No, the small stain is fairly noticeable... but of course, I notice it before anything else!
 
[QUOTE='68 Coronet R/T;22924]Is this a spot that only you are going to know is there?
It has been my observation that once I know there is a flaw, no matter how small it is or inconspicuous it may be, that I can't keep my eyes or thoughts off it. LOL[/QUOTE]

No, the small stain is fairly noticeable... but of course, now I see it before anything else!
 
Horizontal panels are the toughest to blend because you're more likely to have control issues with the overspray. If you do a blend use a touchup gun or dial your full size gun down so the pattern is small and you'll have more controll. Smaller pattern, lower air pressure, less material. The clear will need to go out past the edge of your color blend and have no overspray trapped in the area of your clear blend or you'll have failure for sure. Post up a pic and I'm sure you'll get some good advice.
 
I do love SPI Universal Clear!

Bob Hollinshead;22952 said:
Horizontal panels are the toughest to blend because you're more likely to have control issues with the overspray. If you do a blend use a touchup gun or dial your full size gun down so the pattern is small and you'll have more controll. Smaller pattern, lower air pressure, less material. The clear will need to go out past the edge of your color blend and have no overspray trapped in the area of your clear blend or you'll have failure for sure. Post up a pic and I'm sure you'll get some good advice.
Click to expand...

Thanks Bob,

Using 600 grit paper, first I gently wet-sanded directly over the stain until it was gone, then I sanded from around the affected area to the edge of the roof - which formed a sanded-out rectangle. I then wet-sanded the rest of the roof with 800.

Next... I used a detail gun and shot a light coat of the single stage red, and followed up with two coats of SPI Universal Clear over the sanded area. I set the spray pattern to vertical and shot starting from the masked door window, traveling upward directly over - and slightly beyond the rectangle.

For the third coat of clear, I used the Devilbiss 670 Plus (with the spray pattern also set to vertical), I shot a wider coat of clear over and around the affected area.
I attached a couple pics. Please keep in mind, I'm totally a hobbyist, and I am certainly not a pro painter, but it does appear that the paint color blended okay.


I do love SPI Universal Clear! I just ordered more, and plan to shoot 2-3 more coats over the entire car. With a total of 5-6 coats, hopefully there will be enough material to cover-up this blend and sand-out all the other junk!


Ralph 2012-08-03, RH_roof_stain_002.jpg

2012-08-03, RH_roof_stain_001.jpg
 
It will be fine, get your next round of clear on her and you'll be ready for a cut and buff. Shoot three coats of clear to give yourself some room for mistakes during the sanding and buffing if you're new to this.
 
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