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Paint Finish Went Dull Overnight


 
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RTR
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PostPosted: Tue Nov 05, 2019 3:00 pm    Post subject: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

I cleaned these parts with a wire wheel on a grinder, wiped them down with acetone, and sprayed them with rustoleum primer. They were allowed to dry for 36 hours before I color painted them. I painted these parts with rustoleum regal red paint in a spray can and they had a very nice gloss to them that was almost flawless after applying 2 coats of paint. They then dried that evening and overnight and I noticed they had A dull finish about 24 hours later. I do remember that there was a considerable amount of dew on the parts the next morning before the sun dried them out. I m not sure what caused the finish to go so flat and dull, but I ve painted many many parts and items just like this before with no problems at all. The battery box side is shown installed so you can compare it with the rest of the parts that have gloss.

I know I can lightly sand and repaint; but I would like to know why this happened so I don t repeat it.









 
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Stephen Newell
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PostPosted: Tue Nov 05, 2019 3:32 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

It's called blush. It's when moisture from the air literally gets into the paint and comes to the surface screwing up the sheen. You have to watch humidity levels when painting even using a brush. Generally
the faster drying the finish is the more prone to blush it is. I don't paint when the humidity is above 70%. When it's border line you can add additives to the finish to slow down the drying time. Assuming you
used an oil based enamel you could use Flood Penetrol to the paint.
 
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RTR
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PostPosted: Tue Nov 05, 2019 4:40 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

CVPost-Stephen Newell wrote:
(quoted from post at 04:32:07 11/06/19) It's called blush. It's when moisture from the air literally gets into the paint and comes to the surface screwing up the sheen. You have to watch humidity levels when painting even using a brush. Generally
the faster drying the finish is the more prone to blush it is. I don't paint when the humidity is above 70%. When it's border line you can add additives to the finish to slow down the drying time. Assuming you
used an oil based enamel you could use Flood Penetrol to the paint.


I learned something. Thank you. I ll keep that in mind next time I m shooting paint with my hvlp for sure. What should I do to fix these parts?? Do I need to scuff with sand paper and just re-spray?
 
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David G
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PostPosted: Tue Nov 05, 2019 5:38 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

I would agree with Stephen.

I use gun and can mix in different speeds of reducer to get the drying time wanted.

I hate spray cans.
 
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rob in nh
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PostPosted: Tue Nov 05, 2019 6:10 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

Thats discouraging, all the labor it took to get it ready and you end up with that. I would use a automotive paint next time, be a much better job.
 
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Stephen Newell
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PostPosted: Tue Nov 05, 2019 6:36 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

The only fix is to scuff sand and put another coat on. Just be sure to wait until the weather is better.

Had you used lacquer it would have blushed so bad the color would be pink from the water.
 
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RTR
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PostPosted: Tue Nov 05, 2019 6:59 pm    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

rob in nh wrote:
(quoted from post at 07:10:33 11/06/19) Thats discouraging, all the labor it took to get it ready and you end up with that. I would use a automotive paint next time, be a much better job.


I agree I don t like using spray cans either but when you have 2-3 parts to paint last minute and you have to paint them before it gets dark after work; you don t want to mix paint and have to shoot and clean up afterwards. Spray cans are so easy for small jobs. I work on this stuff away from my home too so I had to stop after work and get it sprayed and head home to cook dinner. Since I have to paint outside this isn t the easiest to avoid. I will remember for next time, but Here in Alabama there isn t a low humidity time of the year! Haha
 
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dr sportster
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PostPosted: Wed Nov 06, 2019 10:06 am    Post subject: Re: Paint Finish Went Dull Overnight Reply to specific post Reply with quote

Parts got hazed from humidity or actually water from condensate right on them . Just scuff sand lightly and shoot more paint.
 
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