Paint crazing

[CarsonsChaos]

What am I doing wrong??????
I shot the base black. Dupont Chroma.
Then Dupont 150 clear for an intercoat and the crazing began.
What happened????

[RRPilot]

What was your base prep like?

Explain the process you used from the begining ie.

plastic or metal
what primer
what grade paper did you use to prep it,
drying times etc.

[CarsonsChaos]

I was painting a metal gas tank.
Primer was 2K.
Sanded with 600 wet.
About 5 to 10 minutes between coats. closer to 5.
I also painted 2 plastic side covers that came out OK.
Funny thing is one side of the tank came out OK.
The other side was bad.
It looks like I can easily sand most of it out with 600.
Another question, it is black base.
Is it the black that cracked or the clear.
I can't see primer through the base.
Can I sand the clear out enough to recoat and fill or it usually required to base again.

[Cowboy]

Hey Carson, How long did Ya wait before Yer clear, If Ya cant see the primer thru the cracks It sounds like Yer inter coat problem, I never used that before , Is it just a clear base coat Or a top coat clear. Sounds like the Culprit,

[CarsonsChaos]

It's what they start with when mixing up colors.
It's funny that the 2 plastic parts, a trunk lid (I was going to test some graphic colors on), and even the other side of the tank seems to be OK.
I painted it all at the same time.
I used a mid temp base maker in 80 degree weather.
I think it's 7175s or 7571s.
I was going to mix some candie with it later, now I'm alittle concerned.
It's bad enough on the base but it would really hurt after the graphics.

[Cowboy]

Carson I Never used intercoat clear I allways Use the finish clear, then graphics Then clear, I Just dont pour it on like the final. I never trusted that intercoat crap. It does sound weird though That only part of it did it. Possible contamination Maybe , Did You wipe the base down with sumpthin before the clear. I,ve seen Guys use tack rags & rub a lil to hard and cause all kinds of problems . Just thinkin outloud here. Good luck.

[CarsonsChaos]

No wipe down after the base.
I'll knock down the tank with some 600 and reshoot some black.
The 150 isn't really an intercoat I don't think but I though it would work OK.
Not sure I'll try it again.
I was afraid of buildup, but at this rate I'm going to get buildup anyway.
What do people use for intercoat in dupont??
The hot hues stuff is high$$$$.

[Cowboy]

I cant tell Ya Carson , Cuz I dont use intercoat , Not sure how many other Dupont users there are here. I just shoot 2 light coats of the top clear , leter cure wetsand Then the art. & never had any problems . Good luck.

[CarsonsChaos]

Thanks.
Lesson learned.
Hard learned lessons are not soon forgotten.
Good thing I've got alot of extra paint.:speechless-smiley-0

[redanner]

Crazing usually occurs when the shop is to cold. Basically, the original finish which is being coated may be of such a nature as to break down, showing a craze pattern.The surface tension of the original material is under stress and literally shatters or break up under the softening action of the solvents being applied.

[CarsonsChaos]

Not sure if the black cracked or the clear base.
I don't see primer through the cracks.
Next time I'm going with final clear to seal the base.
I'm alittle gun shy with the 150 Nason clear base.
Maybe I'll play with it through the airbrush with pearls or something.
Garage was about 80 degrees through the whole process.

[Airbrushkid]

Here take a look and read.

http://www.sherwin-automotive.com/reference/troubleshooting_guide/cracking/index.cfm

Heres the main page.

http://www.sherwin-automotive.com/reference/troubleshooting_guide/

[CarsonsChaos]

One more question.
I started sanding with 600 wet but that was really slow.
Now I'm soft bocking it with 400 wet.
Can I get away with shooting black base over the 400 or will I have to hit it with 600 again?

[Cowboy]

Carson, 400,s perty coarse I,d go back with the 600 after & smooth those scrathes out if I was You, Good Luck.

[CarsonsChaos]

Sounds like a plan.
Thanks.

[Primo Customs]

Binder is not meant to go on thick at all... Inter coat clear is the same as binder... I have seen inter coat clear ruin lots of candie jobs here in california.. I use thin really thin clear. or adheasion clear.. Rick

[CarsonsChaos]

Thanks to everyone with your responces.
Now for another Question.
I shot the black, then a coat of Nason.
Worked a whole lot better.
Now for the next part.
I am shooting an old trunk lid at the same time to test some flame effects.
I shot AA white pearl
AA white fine metalic
Red pearl powder in future floor finish
gold pearl powder in future floor finish
Then Hot Hues red candie.

The effect I liked best was actually were the pearl powder oversprayed under the paper. Imagine that.
Now can I use the binder to airbrush the pearl onto the Nason clear??
The clear is to thick to brush.
Or am I going to wrinkle the clear?
I've read were some use future but I don't want to start over again.

[Cowboy]

Carson, I know its extra work, But I ussually also do a test panel along side of the project so I can experiment & know what to expect, I would think You,d be safe using duponts Binder to shoot the pearl, As long as the clear is fully cured, & cant tell Ya about the future, I had the wife pic Me up some & going to experiment with it. But haven,t yet. good Luck.

[CarsonsChaos]

It's me again.
Only this time I'm not fishing for asnswers to my problems.
I just shot the red candie over the black tank with the white pearl flames.
OH MY. The colors are just what I was looking for.
The only thing I should have done was seal the flames
before I unmask them.
I used AutoAir to fog in the flames.
I couldn't really clean the tank like I needed to without wiping off the flames.
I went with 2 mist coats of candie.
Then I hit it with a wet coat.
A few spots tried to fish eye along the tape edge, from the tape
I assume.
It was on the black so color wise, it didn't effect the candie darkness.
I hit it with a couple more mist coats with plenty of flash time.
2 mist coats of clear then a wet coat of clear.
It did a fairly good job of filling the eyes.
So I'll 600 out the nibs and slick it up, clean it good and hopefully it will slick out what's left of the eyes and come out pretty nib free.
Sound like a plan???????

[CarsonsChaos]

OK, maybe I do have a question.
Is 600 the best choice in paper??
Or can I go with something like 1000 grit.
I will be curing for atleast 48 hour before I
can do any reclearing.

[Cowboy]

Hey Carson, Yep if Ya got the clear on. 1000 will be fine ta smooth Her out before reclear. The chemical reaction will provide the bite Ya need between the clears. Just be really carefull not ta break thru Yer clear or it could cause problems around the edges of the break . . Good luck & looking forward to some pics .