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Old 03-03-2014, 07:43 PM   #1
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Default Flat Paint Crackling, need help, any ideas?

I've been having some issues with paint crackling. I think someone once called it alligatoring. It is usually happening when applied by brush, and on top of overspray. I've been having this problem a lot when we cut around trim, after it has been sprayed with semi-gloss paint. The semi is fully dry. This was happening a lot in the summer so I figured it was humidity, but now in the winter, it is still happening, worse then the summer.

Any ideas or if anyone know why this is happening would really help. Thanks in advance!
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Old 03-03-2014, 07:48 PM   #2
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maybe your BBQ is set up to close to your work area
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Old 03-03-2014, 07:55 PM   #3
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Quote:
Originally Posted by CNQ View Post
I've been having some issues with paint crackling. I think someone once called it alligatoring. It is usually happening when applied by brush, and on top of overspray. I've been having this problem a lot when we cut around trim, after it has been sprayed with semi-gloss paint. The semi is fully dry. This was happening a lot in the summer so I figured it was humidity, but now in the winter, it is still happening, worse then the summer.

Any ideas or if anyone know why this is happening would really help. Thanks in advance!
I did several rooms last summer using flat over sg. It was a rush job, so we did 2 coats in one day. It alligatored big time where it was rolled. One of the rooms we didn't do twice that day did not alligator.

As far as your problem, I would try a couple thin coats next to the trim rather than trying to put it on too heavy.
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Old 03-03-2014, 08:15 PM   #4
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Are you sanding the overspray first?
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Old 03-03-2014, 08:26 PM   #5
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^^^^^ Problem solved ^^^^^
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Old 03-03-2014, 11:28 PM   #6
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Yes we are sanding the over spray. What a pain!
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Old 03-03-2014, 11:32 PM   #7
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alligators in Toronto ? Dam global warming
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Old 03-03-2014, 11:44 PM   #8
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Yes we are sanding the over spray. What a pain!
No sh!t. If I ever quit this line of work, it's gonna be because of all the damn sanding.
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Old 03-03-2014, 11:57 PM   #9
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My guess would be the semi-gloss paint is still curing and releasing gases, or even shrinking as it cures. Flat paint has a low binder content, so it's likely to crack because of the pressure coming from underneath. I don't think it's an adhesion issue.
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Old 03-04-2014, 01:04 AM   #10
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You should be experiencing "mud cracking". Application too thick, top of coating is drying as underneath is wet and top splits. Application over a semigloss will take much longer to dry, similar to over oil aerosol, this exacerbates the problem.
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Old 03-04-2014, 01:07 AM   #11
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Quote:
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No sh!t. If I ever quit this line of work, it's gonna be because of all the damn sanding.
A carpenter buddy was telling us that we should call ourselves "sanding contractors", because that's mostly what we do.

It sure seems that way sometimes.
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Old 03-04-2014, 01:13 AM   #12
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What paint?

I spray trim 1st w/ppg promar 200 semi white & an hour later spray the walls flat almond color.

I dont sand & have yet to experience this. Maybe cause i use latex?
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Old 03-04-2014, 04:20 AM   #13
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Any chance you're cleaning your brushes with lacquer or something similar? I've seen latex & oil paints crackle due to brushes being washed in lacquer.
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Old 03-04-2014, 04:27 AM   #14
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Painting over old wall paper PASTE residue will do this for sure
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