painting

I can never remember this: When painting a ceiling, do you roll it out parallel or perpendicular to the main natural light source? The 3 windows in the room I'm painting all face east.
TIA,
Joe C.
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Jeez!
I've painted quite a few ceilings and I have never thought about this, but it really does makes sense I suppose - for walls too in some situations.
I would guess that you would "roll" perpindicular to the main light source so as to minimize roll marks.
This assumes that your drywall/plaster is perfect to start with- mine never is.
Next time I do a ceiling, I am definitely going to try to impress SWMBO and anyone else standing by!
Thanks for the tip.
Lou

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a) you wouldn't roll solely in one direction anyway, you'd roll in a couple directions and at angles to any straight lines in the room b) with flat paint and careful application, it won't matter anyway.
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