04-05-2012, 11:02 PM
The long wait could be a contributor, but I still lean toward under cure after looking at the powder descriptions. Knowing they're both Polyesters, probably eliminates the incompatibility pretty well.... I don't think I've ever waited to shoot a second coat that long.... Something to try one day.
Originally Posted by weaselchew
06-05-2012, 07:23 PM
what did i do wrong/how did i mess up?
im new to this forum and powdercoating..hello im coating valvecovers, i used cryscoat to the parts then ogf grey primer coated perfect,then did the second coat with ss black wrinkle thats when i mess up....had a good ground and turned down the kv's and i was getting alot of round circles popping out the powder...but if i took a bare valve cover and coated it with black wrinkle without primer had no problem....please help im pulling my hair out...lol
06-05-2012, 07:36 PM
Probably not truly a good ground.... This is not unusual on subsequent coats. You need to make a clean bare spot to ground to again, after curing the first coat..... use a small round file (I good use for that little chainsaw file) usually will do the job. Just make sure the hook isn't interrupted by powder where it was hung on the first coat... sometimes the powder will melt in between the hook and thepart (Actually this is more common than not), and cause the issue you're having. The spots that are popping out are back ionization, and are caused by excessive charge on the surface of the first coat of powder, because there's no path to ground due to the aforementioned melting between thing.... Clean it up, and re-shoot. You'll be fine.
Originally Posted by harrison32
06-05-2012, 10:27 PM
thank you,that worked perfect
06-06-2012, 06:33 PM
At Last! Someone listened instead of trying to bypass the way to make things right! This makes me very happy, and Smiley!
Originally Posted by harrison32
04-10-2013, 04:10 AM
Interesting and valuable information.
04-15-2013, 11:27 AM
Good Stuff! We see that happen in the class room from time to time. That is a great answer and right spot on for the fix... Good call on the Ground.
04-23-2013, 11:40 AM
New on here but have been lurking for a long time.
Now the problem. Did some valve covers with PBTB pearly grapes color and it came out textured, not smooth. Surface was clean and perfect for coating, had very good adhesion, etc. Pre heated covers too. It just seemed like it didn't want to flow out.
But actually I went with it because it looked pretty awesome.
But anyway, why did this happen? I have one more part to do in this color but I don't want this textured look on it.
04-25-2013, 04:42 PM
Well my friend I don't think you did anything wrong with The Pearly Grapes Powder. I took a look at the picture and clicked on Zoom, on our website, and it seems to look the same as the sample panels.
Here's the link http://www.powderbuythepound.com/THE_PEARLY_GRAPES/
If you want to go with a shinny-er gloss then I would use http://www.powderbuythepound.com/CRY...H_GLOSS_CLEAR/ or http://www.powderbuythepound.com/SUP...EAR_STARLIGHT/. Both of them will make your parts POP.
08-29-2013, 12:52 PM
This sounds like a solution to a problem I had today after shooting my second coat over primer,been pulling my hair out looking for answers and hopefully this advice should help,will let you know how I get on when I re-shoot tommorow
Originally Posted by SCOTTRODS