PPG clear over Krylon?
11-08-2014, 12:02 AM
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My limited experience with spraying 2 part clear over cheap rattle can paint is that the paint needs to be well cured, as in a couple of weeks cured the light misting of clear for the first few coats works well also.
the downside with what your doing is that a test won't always reveal a reaction and it still might on the real part, also often it will wait until the last wet coat to react.
If you wanted to make absolutely sure there wouldn't be a problem I would be inclined to do 2 or 3 mist coats and one wet coat of clear then let that cure for a week sand it with 400grit and do a proper clear cycle, that way the first round of clear should seal the paint.
In truth its probably easier to just redo the color in decent paint depending on the scheme.
the downside with what your doing is that a test won't always reveal a reaction and it still might on the real part, also often it will wait until the last wet coat to react.
If you wanted to make absolutely sure there wouldn't be a problem I would be inclined to do 2 or 3 mist coats and one wet coat of clear then let that cure for a week sand it with 400grit and do a proper clear cycle, that way the first round of clear should seal the paint.
In truth its probably easier to just redo the color in decent paint depending on the scheme.
11-08-2014, 01:49 AM
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I've sprayed PPG clear over Lustrakote, Krylon, Rustoleum, Sherman Williams, K&B, Model Master, KlassKote, HOK without problems.
You just have to ensure your base coat is cured and lightly scuffed.
When spraying on different base coats I usually spray :
1 dust coat(5-8 minute flash off)
1 very light coat(10-15 minute flash off)
1 mid coat(15-30 flash off) - if you're going to have a problem it will start showing here during flash off
1 flow-out coat (not real heavy)
Avg temp= 70-75 degrees
You just have to ensure your base coat is cured and lightly scuffed.
When spraying on different base coats I usually spray :
1 dust coat(5-8 minute flash off)
1 very light coat(10-15 minute flash off)
1 mid coat(15-30 flash off) - if you're going to have a problem it will start showing here during flash off
1 flow-out coat (not real heavy)
Avg temp= 70-75 degrees
11-08-2014, 08:46 AM
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I re-painted my Trusty Boomerang with Krylon white and Rustoleum professional (silver can) red. Then clear coated with PPG DCU2021 Clear coat. I sprayed a light tack coat let dry for 7-8 minutes and then sprayed wet coats. No issues and that was two years ago. I also thin my clear 80- 100 percent meaning I do the PPG recommended mix 4:1:1, then reduce that further with reducer to almost double the volume in the cup. Thanks . Jack
11-10-2014, 04:47 PM
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Originally Posted by Jack28
I re-painted my Trusty Boomerang with Krylon white and Rustoleum professional (silver can) red. Then clear coated with PPG DCU2021 Clear coat. I sprayed a light tack coat let dry for 7-8 minutes and then sprayed wet coats. No issues and that was two years ago. I also thin my clear 80- 100 percent meaning I do the PPG recommended mix 4:1:1, then reduce that further with reducer to almost double the volume in the cup. Thanks . Jack
More thinner than recommended. Put on a tack coat and almost immediately followed by a wet coat.
Thanks, Mike
