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Old 04-22-2013, 02:23 PM
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lacquer paint help

I am spraying a side mirror using dupli color new ready to spray lacquer black. I I was using my iwata lp50 with a 1.2 and air set around 30 psi. As I was spraying I was getting a bad feel about the paint. The droplets looked un even and poor. I started to adjust the air and started getting a string spider web texture. At that point I stopped . I am new to lacquer so what did I do wrong.

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Old 04-23-2013, 06:30 AM
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This is probably more information that you want but here goes anyway...spiderwebbing paint is really called lacquer checking.
Lacquer checking is a term that was derived when all cars were painted with lacquer, and those minute cracks would form. The term is still used today because the word checking means cracks (ie. tires are weather checking) and hardly anything is painted with lacquer, but lacquer is synonymous with paint so there you have it.
It's intresting to note that before they learned how to apply it with a spray gun, cars were painted with a brush, and color sanded to smoothness, then buffed to a shine. My grandfather had a model T that in the fenderwell, I remember, you could see brush marks when he took it apart to paint.
The paint sometimes shrinks more than the surface it's painted on, and causes the minute cracks. The problems that cause this can be various.
1. the surface is in extreme heat (arizona on a fiberglass car).
2. the paint wasn't painted using the correct solvents/hardener.
3. the paint is a 2 part paint repaired with a 1 part paint.
4. the paint has not been properly cared for, and the paint has reached the end of it's life, and is no longer flexible to expand and contract with the surface it's painted on.
5. the surface it's painted on flexes more than the paint flexibility will allow.
6. the wrong paint on the wrong surface.
7. enamel over lacquer when a repair is performed.
8. the wrong amount of hardener in a specific quantity of paint.
9. too much retarder in the paint.
10. too much accelerator in the paint.
I hope that this answered your question. Good Luck
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Old 04-23-2013, 09:18 AM
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I used lacquer for about 40 years... many of those working full-time.

That stringing paint is actually called cobwebbing.

Usually that cobwebbing means that the paint does not have enough thinner in it, so it will not atomize correctly.

Find something to test the gun on besides the mirror.

First try moving the gun a little closer to the surface. That allows the paint to arrive at the surface with a little more solvent still trapped in it. Also, if you open the paint knob slightly, putting a heavier coat on, it may flow out a little bit better.

If that doesn't work, add a small amount of lacquer thinner, and try a test panel, continuing to add thinner until you have the mix right. That should solve the problem for sure!

When it works well on the test piece... paint the mirror.

Last edited by TucsonJay; 04-23-2013 at 09:24 AM.
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Old 04-23-2013, 12:06 PM
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Thanks for the advice guys
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Old 04-24-2013, 05:57 AM
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how much did you thin it?
Lacquers usually thin 100% or more.
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Old 04-24-2013, 06:28 AM
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Quote:
Originally Posted by jcclark View Post
how much did you thin it?
Lacquers usually thin 100% or more.
jc, it is allegedly rts, so I don't think 100% would be correct. Maybe 5-10 % to start with?
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Old 04-26-2013, 05:49 PM
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Quote:
Originally Posted by Old Fool View Post
jc, it is allegedly rts, so I don't think 100% would be correct. Maybe 5-10 % to start with?
Added around 10 % and it sprayed way better.
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