Ok paint guys. First the background. Primed car using ppg omni 170 epoxy primer, high build on top of that, blocked out the car looks great. Paint using ppg Deltron 2000DBC, clear using ppg concept dcu2042.
Painted the car over the weekend, Base went on great, clear laid out nice except both rear quarters ran like an Ethiopian chicken. At first thought my be cut the runs, to many to thick. Tried to sand the runs down but wound up going through to the primer. So aim stuck with having to prime the quarters again and re shoot. Now i am getting large and small blistering spots, first it was roughly 30 spots that need to be sanded and reshot. Got the first 30 down to maybe 10, got those 10 down to 4 fix the last 4 and back up to 8.

The blistering looks like aircraft stripper is being used, what can I do to stop this?
Sorry, cant find the cord to the camera so I don’t have picks available

Thanks for any assistance in ending this nightmare

 

Just a couple of questions:

1. Did you sand the epoxy prior to high build and if so what grit?
2. What was the final grit used in blocking the high build?
3. Did you use a sealer over the high build?
4. Did you match the reducer in the base to the temperature?

These are the typical problems associated with blistering and lifting.

 

snake, answers to your questions
1. i did sand the epoxy but its been a while and i recall what grit i went down to.
2. final grit was 600.
3. the high build i used had a built in sealer (according to the paint shop).
4. reducer temp i am using is 60 degrees, temp in the garage is mid 50's bu i do have a high out put heater i am using.

what can i do at this point?

 

I had the same problem and it was a temperature issue with me. Im not a paint expert like some people on here but I refuse to paint unless the out door temp is at least 68 degrees when painting in my garage.

I see your using a heater but that may not be enough.

 

I know you won't want to hear this, but the only real solution to blistering is to sand and repaint. Before you do that, you have to find the cause. I would have used a sealer over high build as it give you a stable and consistent surface, but that is probably not the root cause. Was the high build a ppg product? Your issue sounds like adhesion, but some pictures would be very helpful.

 

Did you wipe it down with a wax and grease remover? Sometimes you can have problems with adhesion and blistering especially if you wipe down with the wrong stuff (some solvents or mineral spirits)
Did you use a water trap?
Were your hoses free of oil? An inline oiler will cause fish eyes and bubbles.
Good Info from PPG:
Paint defect causes for blistering
Moisture or contaminants trapped under the surface. This may result from:
a) Inadequate surface cleaning, leaving residual moisture or contaminants such as oil, industrial pollutants or grease from finger tips.
b) Incompatible materials or the use of non-recommended thinners.
c) Insufficient thickness of paint leading to increased permeability.
d) Water permeating both newly applied and aged films. Exposure to rain or high humidity before the finish is fully hardened increases the risk of blisters caused by permeation.

I agree with Fakesnakes. You will probably have to sand and start over, I know that is not good news....

 

yes my concussion was start over as well and have 5 flipping times.....
i did use a ppg high build.

my question is why now not at first. fist time around everything was fine, until i screwed the pooch on the clear that's when my issue started. i get one blister fixed then another appears what the *#ck? I have been chasing my tail for 3 days and at 150 a quart i cant afford to go much more, iam in it for the long haul.
what can i do? I have stiped, and re coated, stiped and recoated and striped and recoated and stiil the blistring "Not alwase in the same place".

 

i think this is my issue - once i fix one blister and re coat the other one pops up near the one i just fixed, but the additional coat (lite coat) is needed to blend.

 

I think you need to take it down to a solid surface. I am not sure if it is the base, high build or epoxy but your eyes will tell you. A DA sander will work pretty quick if you have one (Harbor Freight has one I use for 20 bucks).
Wipe down everything.
Then you need to seal everything with an epoxy primer seal coat for a good foundation. Stay within your time windows
Apply BC/CC again and watch your time windows (and temp/ humidity).
I found a great forum for professional painters who will help you out with qustions or problems over at hotrodders.com and lots of the pro painters there love SPI paints for price and quality. You might want to check it out if the money tree is starting to die from all this.
Dont give up just yet. Figure it out and try again.

 

It is also possible that because you are repairing one section at a time, you are not giving the base enough time before applying the clear.