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Old 08-18-2010, 07:43 PM
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Blocking 2K primer question

I finally finished blocking back my body filler and top coated it with some epoxy primer. I then shot two coats of 2K primer and started sanding it with 600 grit per the tech sheet. After a few passes the surface felt perfectly smooth and at a quick glance looked great. When I look at the surface in just the right light, however, I see this:

I have a feeling that if I keep blocking it back I am going to burn through to the epoxy. What would cause this? Did I botch laying down the 2K?

Any insight/advice would be appreciated.

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Old 08-18-2010, 08:34 PM
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looks like you might have had i bit of dry spray with the 2k primer i would try to sand it as flat as i can and reprime. spray with a guide coat and 600 block again. when you reprime make sure the gun is spraying well, if you see alot of dry spray your gun is dirty or if you have "fish eyes" you have a contaminent on the the surface of what your priming over. I usually prime a car once block with 180grit the prime again depending on the 2nd primer coat i may prime and block a 3rd time. if a third time is not needed i usually block with 320 guide coat again then wet sand with 600.
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Old 08-19-2010, 02:07 PM
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I agree with the above coments, use 3M Dry Guide Coat and wetsand with 600 unitl you see no more evidence of the guide coat. It may be necessary to apply another coat of primer. This time spend a little time to make sure you are laying it on wet and smooth.

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