kansas2018

The exterior of my house with fiber cement siding has just been painted by a professional with 16 years of experience. He sprayed it with Duration, satin sheen. It looks good most of the time, but when the morning or evening sun shines on it, the spray pattern is quite evident; the paint is terribly discolored. At first I thought this was lack of technique, but yesterday he brushed a second coat on part of it to try to fix it and, although it is better, the brushed part still shows bad markings in that light. Also, one small section was only brushed and it looks just as bad as the sprayed areas. What is causing this problem and can it be fixed?

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Jmayspaint

Looks bad in both morning and evening sun, I guess that means it’s in the sun all day. So it was likely sprayed in the sun as well.

It’s not unusual to see some lap lines on a large surface like that high up off the ground and in critical light. It’s quite difficult to perfectly even out your spray pattern when working off of ladders. This is compounded by satin paint, and the likely application in direct sunlight. If the siding is warm to the touch when painted, and in direct sun the paint just dries too fast and doesn’t flow together well.

As far as fixing it, another coat under better conditions is the only answer, though it will probably become less noticeable over time as the paint cures and looses some of its sheen. I suspect what looks like discoloration in the picture is really just standard flashing/lapping that can happen on a surface like that.

If it was me I’d try to spray it early in the morning or on a cloudy day. Maybe add some extender or water to the paint. Scaffolding or ladder jacks that would allow you to spray all the way across in one go would be helpful too.

You should really take this over to DIY. Maybe the mods will leave the thread open for a short while, it’s an interesting case study.


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Jmayspaint

Could also be that it’s just not covered well enough. That dark line in between the windows is where the spray patterns overlap.

Did it get one coat or two?


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RH

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