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Old 04-06-2006, 03:13 PM
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Help shooting DuPont ChromaBase......

Any tips for nice even metallic coverage???

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Old 04-06-2006, 03:31 PM
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The trick to getting good even metallic with Chroma-base is once you've obtained coverage (side to side pattern) take a step back and spray a light coat up and down. This will make sure you don't get stripes in the metallic.

Good luck.
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Old 04-06-2006, 04:39 PM
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spraying dupont

Ok here goes----if you follow the guidelines on proper spray technique you should be fine. First off the right nozzle size ( I use a 1.3 ) the fan wide open,the fluid 2.5 turns out. Spray with a 75% overlap--6 inches away. Don't spray it too wet and let it flash between coats.On your 2nd coat after its flashed off you can lightly sand and I mean lightly the paint with a 1000 grit dry.The paper will tend to clog a little but your basically going over it like you'd be using a tac rag.After that tac it off and spray 1 more coat and clear.I have never ever been a fan of that north south,east west way of spraying.I'm the first to admit 10 painters are going to have 10 opinions on how to do it.All I can say with no ego intended I've entered that top gun deal 3 times and have 3 first place finishes.I know theres going to be differences on how other painters do it but I can honestly tell you this has been working for me a long time.
Good Luck----Bob
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Old 04-06-2006, 05:15 PM
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Quote from the DuPont ChromaBase Product "P" sheet.

"ChromaBase color dries to a smooth matte finish and should NOT be sanded. Nib sanding of small areas to remove dirt MUST be followed by the application of more color before clearcoating."

If you don't paint regularly and aren't a professional, generally speaking you can get into trouble when applying "tricks" that the pro's use. Sanding the base coat may work under some conditions for experienced professionals but probably won't for the novice or occasional painter. When in doubt always follow the manufacturer's instructions.
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Old 04-06-2006, 08:15 PM
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Be sure to use a good gun with a good fan.
Do SEVERAL test patterns and make SURE you have a good pattern.
Don't know what a good pattern is?
Don't shoot it.
I have no idea of your experience and I'm not trying to be a smart *** but ANY silver metallic is tough to do right. Even with a good gun.
Chroma Silver is quite expensive and I hate to see people waste it from inexperience.
Now,
Chroma will look a little mottled when wet so don't freak right off. Wait till it's flashed till you "decide" it needs more work.
Be SURE and use the proper temp BASEMAKER reducer and NOTHING else.
Don't EVEN think of using Nason reducer.
The Basemaker will stay "wet" longer allowing it to flow out correctly where as the Nason will not.
A drop coat is sometimes necessary but don't back off too far and dry spray it or you'll have some adhesion probs later on.
Color sanding a metallic,or any base is a "norm" for custom paint but it's not necessary for most "good" paint jobs. Just be sure to nib out any "chunks" after each coat flash's good and hope and pray nothing gets in the last coat cause ANY disturbance of the metallic WILL stick out. You can nib and dust a little over that area but don't hammer it on or the flop will be way off.
I prefer to "X" instead of up & down if it's looking rough. Flop won't be as noticable IMO. Just be sure to do your band pass's first as those "last" missed out of sequence pass's are the killer for metallics.
Double strain your paint,the metallics WILL go thru,chunks WON'T. Mix ALL the paint at ONCE and pour off into smaller cans IF needed, Mixing up SEVERAL "batch's" will throw it off too.
Be sure not to run the gun EMPTY. That last little bit of paint left will kill ya too.

Best of luck and I hope this may help some.
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Old 04-06-2006, 08:27 PM
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Bee, you're right on IMO. Chromabase and Chromapremier are one of the most forgiving basecoats to spray IMO. Timing the dropcoat if needed and the right temperature basemakers are key.
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Old 04-06-2006, 08:55 PM
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They are Bob as long as your gun is a good one and you use the proper reducer.
I've screwed up enough Dupont to probbly earn some kind of "award". Hehehe.
I'm not fun'ing you paintworks,Top Gun is WAY cool. I've just F'd up a LOT of Dupont learning.
I'll use Nason in a solid color Chromabase but Nason just flash's SO slow and the Basemaker is really the way to go.
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Old 04-07-2006, 03:28 AM
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I used Chromabase several years ago on my second BC/CC job, but first with metalic. It came out great, with no striping or problems what so ever. I followed the directions to the letter. I used a Devilbis Finishline, non HVLP gun on that job, with the air pressure set at what the directions on the can said. Now, if I could just get used to the HVLP guns!

Not really sure how I screwed up that one. LOL

Aaron
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Old 04-07-2006, 04:50 AM
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Chromabase is all I use, I think it's pretty "user friendly" and is easy
to work with. With metallics you don't want to "pile it on",
don't spray it real wet like you would with a clear coat but
not dry either, just a little less wet than usual and you'll be fine.
I like to let it flash an hour before clearcoating, useing longer flash times
will give less chance of the clear disturbing the metallic.
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