What the ---- Happened? Soft Paint? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-02-2004, 07:55 PM
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What the ---- Happened? Soft Paint?

Hi,
I recently painted my car with bc/cc. The job turned out pretty decent with a little orange peel and a few dust nibs. After 3-4 days I wet sanded the cc with 2000 grit and buffed it out. It looks great. The problem I am having is that it takes very little to get light scratches in it. These are easily buffed out. For some reason the cc seems to be slightly softer than I would expect it to be. I used Dupont ChromaBase for the bc and Nason 496-00 clear with the high temp activator for the cc. I used great care in measuring and mixing both the bc and cc. It has been a month now and it still seems soft. The car has not been out in the sun yet as I am still installing new weather stripping, interior etc. but even being very careful I keep making these light scratches in it. When the paint was laid on it was about 85 to 90 degrees and very humid. Does any one have any ideas what could have happened? Is the Nason clear just that soft? Will it eventully get harder? Is there a fix for this beside repainting it? I think I'm going to have to live with it for now but would like to avoid this problem in the future. Thanks for any ideas / suggestions.

Mike
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Old 09-03-2004, 04:52 AM
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First we will assume you mixed everything to the proper ratio
like you said you did. (if clear is off ratio this is as good as its going to get)

This is not an uncommon problem and is usually caused by solvent trapped in the base coat or sealer if used.
Base being the problem its usually caused by using too Fast a reducer for the temperature and trapped solvents because the top layer was drying to fast, Or improper flash times.
This gets more critical if its real high humidity and high temperature at time of painting along with a slow drying color such as Dk red, Dk blue or black.

Sealer can cause this by using two coats instead of one coat.

IF the above is the problem? than three to five days in the sun with cool down will get the solvent out and the clear will finish curing. (car could set inside for a year and will not finish curing)

If this does not work the only thing it could be is Bad clear activator (starting to go bad and just weak) or clear not activated to right ratio.
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Old 09-03-2004, 06:30 AM
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Hi Barry,
Thanks for the input. I think you may have hit the nail on the head with your observations. I have read a lot of posts about paint problems before attempting this job, so I was aware of the problems caused by inaccurate mixing and so on. I only used 1 coat of sealer. I put on 3 coats of the base mixed with the 7185S Basemaker (85 degrees) and 1 mist coat followed by 2 medium wet coats of the clear mixed with the Nason 483-79 Hi-Temp activator. The temp was between 85 and 90 at the time of application, and very humid. I followed the recommended flash times from the product sheets. The color is a dark red (almost maroon). I did not allow additional flash time for the humidity or dark color so I think what you said about the trapped solvents is probably the problem. I will get the car out in the sun and see what happens. Hopefully that will take care of the problem. Thanks again for taking the time to help. Your willingness to share your experience has helped many of us novice painters get better results.

Mike
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Old 09-03-2004, 07:18 AM
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I think your in good shape!
Just be warned and don't be concerned after about the 2nd day in sun the clear will start to lose gloss (die back) Not a concern!
This is the solvents working their way out and a simple buff job will bring the gloss back.
Nothing like painting in the south!
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Old 09-03-2004, 12:03 PM
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Thanks for the heads up on the die back. I'll get it out in the sun and hopefully it will cure out to a nice hard finish. I'd much rather rebuff the car than have to repaint. I'll let you know how it works out. Thanks again for all the help on this.

Mike
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Old 09-03-2004, 12:18 PM
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Quote:
Originally posted by BarryK
IF the above is the problem? than three to five days in the sun with cool down will get the solvent out and the clear will finish curing. (car could set inside for a year and will not finish curing)
Great point. UV is a miracle tool for curing almost anything. I use it to finish off auto paint, fiberglass, just made a slide bed for my grand daughter and painted it with the crappy oil based paint (crappy but still better than latex enamel). All the above often fail to properly cure inside even after several days but a few hours in sunlight cures them right up.
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