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Pits in paint

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geoff gauger

05-20-2002 18:58:13

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I'm shooting alkyd enamel (Case 2150), it flows out like a mirror but when it dries there are many small pits in the paint film. They don't appear to be caused by dust particles. Could this be caused by water in the air line? I'm thinking maybe water droplets mix with the paint then leave a little "hole " when they evaporate. Anybody experience anything like this? I have a filter regulator with water trap in the line but maybe it's not doing the job.

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Jerry B

05-21-2002 08:26:12

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Re: Pits in paint in reply to geoff gauger, 05-20-2002 18:58:13

You may be suffering from "solvent pop" which is a condition caused my the top surface drying too quickly and the reducer is having to burst through the top surface leaving open blisters.

Try using a little less reducer and hardener, spraying thinner coats, and waiting about 30 minutes between coats.

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geoff gauger

05-21-2002 18:48:27

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Re: Re: Pits in paint in reply to Jerry B, 05-21-2002 08:26:12

Interesting Jerry, but here's my dilemma. I've been using
this paint for years (without hardener) and the paint to reducer ratio I use gives a glass surface, if I cut back on the thinner I get slight orange peel. I'll play around with the mix.
Thanks.

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Jerry B

05-23-2002 06:34:24

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Re: Re: Re: Pits in paint in reply to geoff gauger, 05-21-2002 18:48:27

Geoff,
Now we are getting somewhere.
If the method you use gave perfect results prior to this paint job, then something has changed, and most likely it has something to do with your air delivery system.

I don't know where you live but here in Kentucky we have been getting rain every few days for about a month or more and this keeps the air wet. I would bet if you drained your compressor tank you would find considerable amounts of condensation.

One thing I use and it helps tremendously is a toliet paper filter. It installs in the line from the compressor to the regulator and removes the oil and water before it gets any farther. I mounted mine on quick couplings so I could remove it for cleaning every so often.

I also made a water separator from an old drive shaft. Air comes in to the shaft in the middle, water drains to the bottom and is bled out before I use the paint gun. Dry air comes out the top end and from there it goes into the paper filter, then to the regulator.

You probably already do this but I suggest keeping a separate hose for painting only. Keep it put up and closed up until you are ready to shoot paint.

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Rod (NH)

05-20-2002 20:06:07

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Re: Pits in paint in reply to geoff gauger, 05-20-2002 18:58:13

Geoff, check out the site below to see if this looks like your problem. It has possible causes and the fixes needed.

Rod

Fish Eyes

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